Ironically, I’ve preferred the endings of the names reversed: I prefer [name_m]Callan[/name_m] and [name_m]Kellen[/name_m] over [name_m]Callen[/name_m] and [name_m]Kellan[/name_m], but overall I like [name_m]Kellan[/name_m]. I like middles ending in R for these two names.