My name is a quote said by the main character from an JRPG I heard of, Recette, from
Recettear. Only played a demo of it, though. I should buy the full version.
The translators of the game replaced "Yatta!" with things like "yayifications!" or "
yepperoni!" instead, to make the character seem cuter.
Apparently it's gotten pretty popular ever since it hit Steam, even though it was an obscure title. Indie English translators licensed it from indie Japanese game devs, and worked together to make a real game translation, not some hacky patch.