Quote Originally Posted by blackcitadel9 View Post
Matoya did say she adopted Y'shtola. I think she took up her master's name, rather than inheriting a title (or the title inherited is Master). And we don't know if Master Matoya (original) was always being referred to by last name.
It's not her last name, unless she's taken it up recently. Y'shtola and her sister both have the same surname of "Rhul" (as listed in the lorebook).

Seeker surnames aren't family names, as the tribe-letter serves that purpose, but females use their father's forename (ie. their father would be Y'rhul Nunh) so it seems unlikely she'd take on a different surname.