Great grandparents hate name

My Oma and Opa came over yesterday to drop off Christmas gifts.

They said my daughter's name is too hard to pronounce and they will be calling her Grace (her middle name). All I said was Grace is not her name, and I left it at that.

Her first name is Lavinia which I don't think is hard to say, it's exactly as spelt. Lah-vin-ee-ah but when I say it fast it sounds like Lah-vin-ya

She has a million nick-names, can't they just use one of those!? It kind of made me feel bad, I love her name. Now I'm worried nobody will be able to say it!