sibling name...

Looking for sibling (girl and boy) names for big bro Milo. We tend like older names but a few we like are becoming a little popular... however when we named our son Milo it was uncommon and now I see it on here a lot! So far we like Stella, Charlotte, Mia for girls but are having a hard time for boys, and those girl names as getting really popular... any suggestions? thank you!