My Sons are named Sean and Aidan, names i think go extremely well together.3rd Boy coming and need a name.?

Just want one to really add to, Families Irish but its not necessary that it is but obviously to truly blend with Sean and Aidan it must. Sean's 3 and Aidan's 2 and even look alike, jet black hair and green eyes so for me I just feel there's such a grove with there names(and looks), like they roll off the tounge. thank's for the help.