There is no evidence to indicate a deliberate connection.
Similar coincidences certainly do exist in Tolkien's work, with the most well-known being the name Atalantë, used for post-Downfall Númenor and suggestive enough of "Atlantis" that Tolkien himself remarked on it in a footnote to Letter #257:
It is a curious chance that the stem √talat used in Q[uenya] for 'slipping, sliding, falling down', of which atalantie is a normal (in Q) noun-formation, should so much resemble Atlantis.
In this particular case it seems that the Quenya stem was pre-existing, and once Tolkien noticed that it could be formed to resemble "Atlantis", he deliberately chose to do so.
In the case of Barad Dûr, a resemblance to "barred door" doesn't even make sense; there is nothing in the books to make a connection between the Dark Tower and a barred door, and if such a connection were to be made, one would imagine it to be more appropriate to the Paths of the Dead ("the way is shut", etc).
You're going to have to attribute this one to pareidolia.