I think Tamsin is so charming and underused. Enya sounds like nothing to me, like it was made up, like you just stuck two insubstantial syllables, name parts but not full names, together.
I'm happy you think Tamsin is so charming ^_^Enya isn't made up (but you probably know that) and I kinda think that any name a person's never heard before will just sound made up. Thanks for your comment!!