Girl:
1. Anastasia (feminine and pretty) nicknames could be ana, tasia, etc..
2. Marianna (mary-anna)
3. Claire
4. Annabell
Boy:
1. Dominic
2. Evan
3. Zachary
4. William
PS- I saw you liked the name Jacelynn, not sure if it is pronounced Jayce-lynn, Jack-lynn, or jos-lynn ---all pretty, but thought I'd mention my name is Jacqueline (if that's what you ment but dif spelling) and I've gotten a lot of compliments on it being a pretty name. : )
GOOD LUCK!