Are these good names?

Bree • 21 and married to the love of my life. Pregnant with our first baby girl due 22/9/2018 💝

I am 14 weeks pregnant :D my husband and I decided if it is a boy to name him Elijah and if it's a girl Sereya. My nan who i don't talk to anymore made fun of these names, insulted me and said if i named them that, that in school they would get teased. Does anybody like the sound of these names? I like the names but i am doubting them now because of what my nan said.