Alatheia

A variation of Alethea, the name given to the personification of truth in some versions of Greek myth. This particular form might help you to avoid the uh-LEE-thee-uh pronunciation, though it could cause confusion over whether it is said THAY-uh, TEH-uh or THEE-uh at the end. If it's the latter you're after, Alathea might be easier (and used slightly more often).

Pronounced al-uh-THAY-uh.