Tai in "Wayrift"
Tai is the name TsuYa Tai chose to cover his Nefolian identity on the Blue Planet. He first used this on Wayrift Chapter 63, Page 27 when Zeb requested his name. At that point, he didn't want Zeb to know that he was part of the Ya family, or that he could be traced back to Lunars in general.
The name is derived from TsuMeTai, taking the final syllable off the end of the name (what do you expect for having to make a name up on the fly). Most of his Blue Planet connections know him as Tai, though in current days, he chooses to take on both his Nefolian and Blue Planet names, making TsuYa Tai.