I've encountered the first on two ghetto kids--pron. Tai-LEETH-ah in both cases, in one nicknamed to Ty. I kinda like it.
I also used it for a random character once--Tyletha (no mn) Bell.
Shandae--same origin, far as I know, as Tyletha. Said 'Shahn-DAY'. I don't like it as much.
Thoughts?
(insert something clever here)