This is the name of the landlady of The Three Broomsticks (an inn/pub) in the
Harry Potter novels. She's not exactly a major character, but she's still immediately who I think of.
I could see the name as a middle name, but probably not as a first name, though of course it could be easily shortened to some variation on
Rose /
Rosa.
Something about the 'merta' part sounds very maternal to me, which fits in with the whole "fertility" meaning.
Could make a very nice name for (another) witch in (another) fantasy setting or any female character in a steam-punk sort of setting.
This message was edited 6/28/2015, 2:26 PM