Conversation so far:
When did Tristan change Tristan Tzara's name?
in summer of 1915, he was signing his pieces with the name Tristan.
Why did he change his name?
Vinea also stated that Tzara wanted to keep Tristan as his adopted first name.
Are there any other interesting aspects about this article?
Tzara wanted to keep Tristan as his adopted first name, and that this choice had later attracted him the "infamous pun" Triste Ane Tzara (French for "Sad Donkey Tzara").
Did he have any other names?
the variations Tristan Tara and Tr.
Tzara, in 1913-1914 .
Did he ever have any issues because of his name?
CANNOTANSWER.
Did anyone else use his name after he used it?
Samy Rosenstock legally adopted his new name in 1925.

Question: What else is important about his name?
Self-contained rewrite: What else is important about Tristan Tzara's name other than the variations?