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Personally, I think [name_m]Colin[/name_m] and [name_m]Connor[/name_m] are rather close for brother names. [name_u]Cameron[/name_u] and [name_m]Colin[/name_m] also begin and end with the same letter, so that ruled that one out for me too. Of course, that probably doesn’t bother you, or you wouldn’t have them on your short list, but that is the reason I ruled both of those out. That leaves [name_m]Cooper[/name_m] and [name_u]Dylan[/name_u]. They both are wonderful with [name_m]Colin[/name_m], but I slightly prefer [name_u]Dylan[/name_u] so that’s what I voted for! Now that I think of it [name_m]Colin[/name_m] and [name_u]Dylan[/name_u] end with the same sound, but that doesn’t bother me as much as starting with the same sound for some reason! Whatever you end up with, it will be great :). All the best.
I really like me [name_m]Cooper[/name_m] with [name_m]Colin[/name_m]. The sound is enough enough different that it works for me.