I have 6 tulpas, 2 of them have original names, the first and older tulpa, Pandora was kinda a random name that popped in my mind when i was forcing her, in the case of the other original tulpa, Hélia, it was a girl's name that was always special to me (the name of my first crush on a girl when i was in school) so it appears this tulpa picked that up and chosen this name. Also this one is completly original with a human girl form unlike the others which are totally based on anime characters (except on their personalities and memories/story).
The other 4 tulpas were actually pre-existing toughtforms turned into sentient tulpas (2 of them by their own initiative, kinda totally unexpected from my part) from watching animes like dragon ball z and mushiking over the years, more specifically kid Songohan, kid Songoku from first dragon ball series (not the GT one), Chaoz (Chiaotzu from dragon ball) actually he has this name because it's the name officially used in the portuguese dub version i seen. And to finish, Popo is based on Popo from the anime Mushiking guardians of the forest, the main character.
Believe me i had quite a few fears of them having the exact same name, voice, form and even similar personalities to the anime characters, but in two of them i tried to change their names and voices and i felt considerable resistance and it just didn't felt right, so far it appears they are 100% aware they aren't the characters and their behavior and tastes are a lot more based on MINE and not the characters (but of course they picked a few of the characters tastes and behaviors), in resume, they are EXACTLY like i wanted all along, to have sentient imaginary friends with the exact same form, voice and name with a similar personalities from those characters i had such a strong admiration when i was younger, i guess my subconscious started "creating" them without me knowing since these ones as soon as i turned them into tulpas they were instantly vocal and as developed as the first tulpa, even in possession.