My name is Euphemia! My first name, anyway. Most people calle my Effie or Ef, and my mum calls my Phemia. I actually really enjoy having it, besides people misunderstanding that you're saying your name. "You have what?" Yeah. It's really rare, so I like it.
I have a friend who plays the Euphonium, which is a brass instrument that looks like a small Tuba. This is the only image I can conjour up when reading/hearing this name.