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##No

There are many counter-examples. One of the most plentiful droid types in the galaxy is the B1 battle droid. Their predecessors were the OOM-series battle droid. In an earlier question just a few hours ago I identified an RIC-920 general labor droid. Some droids, such as the droideka, don't appear to have any numbers in their name.

The only significance to R2-D2's name is that he belongs to the R series (specifically R2 series) astromech droid. C-3PO is a droid from the 3PO series.

Droid names are usually derived in part from the droid series (e.g. R2 and 3PO) to help identify the function and capabilities of the droid (e.g. "B" in B1 is probably to indicate that it is a battle droid). The series name can have a variable number of characters (likely depending on how many related droid series there are). On the other hand, more unique droids like the droidekas do not need a series name for identification. Characters which are not part of the series sometimes identify a sub-series (e.g. the B2 super battle droid vs. the B1, and the E-3PO is from the 3PO line but is distinct from C-3PO droids). Longer droid names are probably used in order to avoid name conflicts with previous droid models.

Droid names appear to be assigned similarly to, say, real-world firearms (and probably for a similar reason). For example, M-series firearms often denote American firearms, numbers indicate different firearm models (e.g. M16 vs. M4), and other characters indicate different versions of a particular firearm model (e.g. M16A1 vs. M16A3). On the other hand, modern German firearms usually start with "G" (e.g. the G36, which has its own sub-variants like the G36C and G36K). Most Russian assault rifles start with AK, with the number usually denoting the year it entered service (e.g. AK-47 vs. AK-74), but not always (e.g. AN-94). You get the idea...

No

There are many counter-examples. One of the most plentiful droid types in the galaxy is the B1 battle droid. Their predecessors were the OOM-series battle droid. In an earlier question just a few hours ago I identified an RIC-920 general labor droid. Some droids, such as the droideka, don't appear to have any numbers in their name.

The only significance to R2-D2's name is that he belongs to the R series (specifically R2 series) astromech droid. C-3PO is a droid from the 3PO series.

Droid names are usually derived in part from the droid series (e.g. R2 and 3PO) to help identify the function and capabilities of the droid (e.g. "B" in B1 is probably to indicate that it is a battle droid). The series name can have a variable number of characters (likely depending on how many related droid series there are). On the other hand, more unique droids like the droidekas do not need a series name for identification. Characters which are not part of the series sometimes identify a sub-series (e.g. the B2 super battle droid vs. the B1, and the E-3PO is from the 3PO line but is distinct from C-3PO droids). Longer droid names are probably used in order to avoid name conflicts with previous droid models.

Droid names appear to be assigned similarly to, say, real-world firearms (and probably for a similar reason). For example, M-series firearms often denote American firearms, numbers indicate different firearm models (e.g. M16 vs. M4), and other characters indicate different versions of a particular firearm model (e.g. M16A1 vs. M16A3). On the other hand, modern German firearms usually start with "G" (e.g. the G36, which has its own sub-variants like the G36C and G36K). Most Russian assault rifles start with AK, with the number usually denoting the year it entered service (e.g. AK-47 vs. AK-74), but not always (e.g. AN-94). You get the idea...

##No

There are many counter-examples. One of the most plentiful droid types in the galaxy is the B1 battle droid. Their predecessors were the OOM-series battle droid. In an earlier question just a few hours ago I identified an RIC-920 general labor droid. Some droids, such as the droideka, don't appear to have any numbers in their name.

The only significance to R2-D2's name is that he belongs to the R series (specifically R2 series) astromech droid. C-3PO is a droid from the 3PO series.

Droid names are usually derived in part from the droid series (e.g. R2 and 3PO) to help identify the function and capabilities of the droid (e.g. "B" in B1 is probably to indicate that it is a battle droid). The series name can have a variable number of characters (likely depending on how many related droid series there are). On the other hand, more unique droids like the droidekas do not need a series name for identification. Characters which are not part of the series sometimes identify a sub-series (e.g. the B2 super battle droid vs. the B1, and the E-3PO is from the 3PO line but is distinct from C-3PO droids). Longer droid names are probably used in order to avoid name conflicts with previous droid models.

Droid names appear to be assigned similarly to, say, real-world firearms (and probably for a similar reason). For example, M-series firearms often denote American firearms, numbers indicate different firearm models (e.g. M16 vs. M4), and other characters indicate different versions of a particular firearm model (e.g. M16A1 vs. M16A3). On the other hand, modern German firearms usually start with "G" (e.g. the G36, which has its own sub-variants like the G36C and G36K). Most Russian assault rifles start with AK, with the number usually denoting the year it entered service (e.g. AK-47 vs. AK-74), but not always (e.g. AN-94). You get the idea...

##No

There are many counter-examples. One of the most plentiful droid types in the galaxy is the B1 battle droid. Their predecessors were the OOM-series battle droid. In an earlier question just a few hours ago I identified an RIC-920 general labor droid. Some droids, such as the droideka, don't appear to have any numbers in their name.

The only significance to R2-D2's name is that he belongs to the R series (specifically R2 series) astromech droid. C-3PO is a droid from the 3PO series.

Droid names are usually derived in part from the droid series (e.g. R2 and 3PO) to help identify the function and capabilities of the droid (e.g. "B" in B1 is probably to indicate that it is a battle droid). The series name can have a variable number of characters (likely depending on how many related droid series there are). On the other hand, more unique droids like the droidekas do not need a series name for identification. Characters which are not part of the series sometimes identify a sub-series (e.g. the B2 super battle droid vs. the B1, and the E-3PO is from the 3PO line but is distinct from C-3PO droids). Longer droid names are probably used in order to avoid name conflicts with previous droid models.

Droid names appear to be assigned similarly to, say, real-world firearms (and probably for a similar reason). For example, M-series firearms often denote American firearms, numbers indicate different firearm models (e.g. M16 vs. M4), and other characters indicate different versions of a particular firearm model (e.g. M16A1 vs. M16A3). On the other hand, modern German firearms usually start with "G" (e.g. the G36, which has its own sub-variants like the G36C and G36K). Most Russian assault rifles start with AK, with the number usually denoting the year it entered service (e.g. AK-47 vs. AK-74), but not always (e.g. AN-94). You get the idea...

##No

There are many counter-examples. One of the most plentiful droid types in the galaxy is the B1 battle droid. Their predecessors were the OOM-series battle droid. In an earlier question just a few hours ago I identified an RIC-920 general labor droid. Some droids, such as the droideka, don't appear to have any numbers in their name.

The only significance to R2-D2's name is that he belongs to the R series (specifically R2 series) astromech droid. C-3PO is a droid from the 3PO series. Droid names are derived in part from the droid series (e.g. R2 and 3PO) but otherwise appear to have no significance.

##No

There are many counter-examples. One of the most plentiful droid types in the galaxy is the B1 battle droid. Their predecessors were the OOM-series battle droid. In an earlier question just a few hours ago I identified an RIC-920 general labor droid. Some droids, such as the droideka, don't appear to have any numbers in their name.

The only significance to R2-D2's name is that he belongs to the R series (specifically R2 series) astromech droid. C-3PO is a droid from the 3PO series. 

Droid names are usually derived in part from the droid series (e.g. R2 and 3PO) to help identify the function and capabilities of the droid (e.g. "B" in B1 is probably to indicate that it is a battle droid). The series name can have a variable number of characters (likely depending on how many related droid series there are). On the other hand, more unique droids like the droidekas do not need a series name for identification. Characters which are not part of the series sometimes identify a sub-series (e.g. the B2 super battle droid vs. the B1, and the E-3PO is from the 3PO line but is distinct from C-3PO droids). Longer droid names are probably used in order to avoid name conflicts with previous droid models.

Droid names appear to be assigned similarly to, say, real-world firearms (and probably for a similar reason). For example, M-series firearms often denote American firearms, numbers indicate different firearm models (e.g. M16 vs. M4), and other characters indicate different versions of a particular firearm model (e.g. M16A1 vs. M16A3). On the other hand, modern German firearms usually start with "G" (e.g. the G36, which has its own sub-variants like the G36C and G36K). Most Russian assault rifles start with AK, with the number usually denoting the year it entered service (e.g. AK-47 vs. AK-74), but not always (e.g. AN-94). You get the idea...