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I honestly don’t see the point in any nicknames with [name_m]Jacob[/name_m] or [name_m]Caleb[/name_m], they’re both short and solid.
I think [name_m]Jacob[/name_m] nn [name_m]Coby[/name_m] works better than [name_m]Caleb[/name_m] nn [name_m]Cale[/name_m].
[name_m]Just[/name_m] use [name_m]Coby[/name_m] or [name_m]Cale[/name_m]
I would just use [name_m]Coby[/name_m] or [name_m]Cale[/name_m].