What are the 2 blue wizards' name in the hobbit? Gandalf said there were 5 wizards and that he forgot the name of the blue wizards. And are their power stronger than Gandalf's?
Elsewhere in the canon (in "Unfinished Tales") their names are given as "Pallando" and "Alatar". Those names are used in many derivative works, eg the collectible card game.
Much later in his life he wrote more about the blue wizards and named them Morinehtar and Rómestámo ("Darkness-slayer" and "East-helper"). Since Gandalf (and Saruman) had alternative names this is not necessarily a contradiction.
This is discussed in detail at the Tolkien Gateway article.