Nickname for Dorian?

We’ve got around 5 weeks now until our baby is due, and we’re still pretty undecided about his name. We’ve been playing with [name_m]Lucian[/name_m] ‘[name_u]Luca[/name_u]’, [name_m]Raphael[/name_m] ‘[name_m]Raphael[/name_m]’ and [name_m]Bastien[/name_m] ‘[name_m]Baz[/name_m], but none feel like’ the one’. We both really like Thorfinn ‘[name_u]Finn[/name_u]’ but got mixed reviews here and completely negative opinions irl, so we may use it as a middle name, or possibly [name_m]Peter[/name_m]. This will be my only child, so I want his name to be perfect.

[name_u]Dorian[/name_u] is another name we’ve been talking about recently as both of us really like it, but we want to use a nickname, and it doesn’t really have an obvious one. Have you got any suggestions for a nickname? It would be a plus if it went with older brothers names [name_m]Leo[/name_m] and [name_m]Jack[/name_m], but not a must.