Coincidence---I just started watching "Poldark" last night, which takes place in Cornwall, and there's a character in it named
Demelza. Perhaps this is an anachronism, as "Poldark" takes place in the eighteenth century and this site says
Demelza has been used as a give name only since the mid-20th century.
I know this sounds really ignorant, but if I saw
Demelza in a vacuum, I would never think it's Cornish. It looks Spanish to me.
I agree with both you and your boyfriend. It's interesting, but it's also a bit ridiculous and it does sound like a Disney villain. I think it's plain ugly also.