With your sibset, I think that [name_u]Everly[/name_u] works the best. Yes, [name_u]Ainsley[/name_u] and [name_u]Everly[/name_u] both in -lee but I don’t hear a problem with it when said aloud. The different number of syllables seem to help. However, if you add a 4th, you may feel compelled to stick with an -er name for a boy and -lee name for a girl. [name_m]Just[/name_m] something to consider in case you really don’t like any other names with those endings.