I actually really like [name_m]Oslo[/name_m], and I think [name_m]Ozzy[/name_m] would be such a cute nickname! Out of your two combos I prefer [name_m]Oslo[/name_m] [name_m]Ferdinand[/name_m]. Some more ideas:
[name_m]Oslo[/name_m] [name_m]Fitzgerald[/name_m]
[name_m]Oslo[/name_m] [name_m]Finnegan[/name_m]
[name_m]Oslo[/name_m] [name_m]Sullivan[/name_m]
[name_m]Oslo[/name_m] [name_m]Rafferty[/name_m]
[name_m]Oslo[/name_m] [name_m]Vaughn[/name_m]
[name_m]Oslo[/name_m] [name_m]Winston[/name_m]
[name_m]Oslo[/name_m] [name_m]Reeve[/name_m]
[name_m]Oslo[/name_m] [name_m]Reuben[/name_m]
[name_m]Oslo[/name_m] [name_m]Pierce[/name_m]
[name_f]Hope[/name_f] this helps!