Sibling For Clementine and Sebastian

Hello! I’m due with my last baby, due in [name_f]April[/name_f] next year. We already have twins [name_m]Sebastian[/name_m] [name_m]Lysander[/name_m] [name_u]James[/name_u] who we call [name_m]Seb[/name_m] and [name_f]Clementine[/name_f] [name_f]Lillian[/name_f] [name_f]Pearl[/name_f] who we call [name_f]Cleo[/name_f]. We’ve already thought about [name_m]Theodore[/name_m], but we’re worried he’d be called [name_u]Theo[/name_u] which obviously is too close to [name_f]Cleo[/name_f]. We liked [name_m]Nathaniel[/name_m] but our nephew is called [name_m]Nathan[/name_m]. We’re completely stumped. We’ve not found out the gender yet, so we’re looking for options for both genders, plus two middle names. Thanks for any suggestions!