My mom actually came up with mine. I was 7 years old and was eager to join in on the Webkinz trend at my elementary school. I loved Bionicle and my favorite number was 30, so she swapped Toa Tahu's name and title around then put 30 on the end.
These days, saying my name is like saying Elizabeth Queen-- it's the same two words but because they're swapped you imagine a completely different person (as your brain likely just demonstrated for you.
who tf is Elizabeth Queen??? Queen Eli-- OHHH).
When I joined ROBLOX two years later in the rainy season of 2009 (another trend at my school), I didn't use the number 30. I would later, after I fell prey to a scammer
(his user was reddawg5, which I'm surprised I remember). I had to use a 2nd account for a while. The funny thing is years later I changed the tahutoa account's password back to what it was when I'd gotten scammed.
But ROBLOX is where "tahutoa" by itself comes from. For a long time, I continued to use variations on it, usually with numbers and/or capital T's, but like any maturing human being I ended up lopping off the unnecessary parts. I came back to the ROBLOX version again and again, and that's the name that gained any traction. That's the version of the name that would be used the most often. I eventually came to hate when people capitalize the T.
Surprisingly, it's based on my Lycos password from like, 20 years ago. I don't think anyone even remembers that service anymore!
I recognize that name, though! I think I heard it on the YogPod. (Their ages were 31 and 25 in 2009.) They also used Ventrilo for their chats, which I assume was the big name directly before Skype.