Third child....but what name??i need help!!

I have two sons,Caelan Alexander,I love that name,and Jayden Thomas Edward,Caelan named Jayden,and middle names were after my dad and grandfather,both of whom passed away.I have no clue where to even start with a third name.I'm unsure of gender.and I like Kylie,Jaylie and Malliyah for a girl,with the middle name Alleannah.I like Kieran,Owen and Kyle for a boy,but I'm totally unsure of these names..I want to find one that sounds good with my boys names.Both their names are 6 letters,2 syllables,but That doesn't really matter,It's not a naming theme..any suggestions???