How did I not get this earlier...?

I've heard people say Thalia's namesake is the Muse of comedy. BTW, you're spelling it wrong. It's Thaeleia, not Thalia. But, I do know her true namesake.
I was looking up minor gods for a story and I came across three goddesses called the Graces. I noticed the Grace of good cheer was named Thalia. Thus, Thalia Grace. Duh.
Anyway, that's just for who never noticed that :)