What should I name my 3rd child? I don't know what the of the baby is yet but I'm due next month!

I have an Ella (f) and Ashtyn (m). I have a girl's name already picked out, but if it's a boy, I think he will be nameless for a long time! Please help me pick out something that goes well with my children's names. Either a vowel as the first letter, or an, -en ending name. So far we like, Kingson, Tryston, Chayce, Barron, Jagger. But, nothing is tickling my fancy so far. I like names that aren't as common. Your help is greatly appreciated!