Lea always throws me, I never know if its supposed to be like Lee or Leah. I've taught a few that are pronounced like Leah and then i've got one in my class but it's pronounced like Lee and my husbands aunty is Lea (Lee) but it's short for Leanne..
Lea is beautiful, although I like the spelling Leah more. De Seine? Do they have a connection to Paris or Seine? Otherwise it just sounds like they're trying too much.