Her name means "pure silver" in Welsh. Gwen's because the G in Gwen (which means "white" or "pure" or "blessed") drops off when it's used attributively with a feminine noun, which "Arian" is ... well, actually "gwen" is always used with feminines, because "gwyn" is the masculine, but I expect you've now learned more about Welsh than you wanted to...

I could go on about Gwen, what a loving darling she is, but I'll spare you. Just check out her pictures!