So far I am liking…
[name_m]Otto[/name_m] [name_m]Julian[/name_m] or [name_m]Julius[/name_m]?
[name_m]Otto[/name_m] [name_m]Jasper[/name_m]
[name_m]Otto[/name_m] [name_u]Emerson[/name_u]
[name_m]Otto[/name_m] [name_u]Sterling[/name_u]
[name_m]Otto[/name_m] [name_m]Silas[/name_m]
[name_m]Otto[/name_m] [name_u]Blake[/name_u]
[name_m]Otto[/name_m] [name_u]Jude[/name_u]
Thoughts? Other suggestions?
Thanks everyone!
[name_m]Otto[/name_m] [name_m]Julian[/name_m] & [name_m]Otto[/name_m] [name_m]Julius[/name_m] are fabulous. My great grandfather was actually named [name_m]Otto[/name_m] [name_m]Julius[/name_m] - they sound wonderful together. I don’t really have a preference to one or the other. If I had to choose I’d say [name_m]Otto[/name_m] [name_m]Julius[/name_m], just because [name_m]Julius[/name_m] is far less common. [name_m]Otto[/name_m] [name_m]Jasper[/name_m] would be my pick after that.
Good luck! 
OH my, I really like so many on your list that it is difficult to choose a favourite so I will choose four. I hope that helps, lol.
[name_m]Otto[/name_m] [name_m]Julian[/name_m]
[name_m]Otto[/name_m] [name_m]Jasper[/name_m]
[name_m]Otto[/name_m] [name_u]Blake[/name_u]
[name_m]Otto[/name_m] [name_m]Silas[/name_m]
[name_m]Otto[/name_m] [name_m]Jasper[/name_m] and [name_m]Otto[/name_m] [name_m]Silas[/name_m]!
I love [name_m]Otto[/name_m] [name_m]Julian[/name_m] / [name_m]Julius[/name_m]!
[name_m]Otto[/name_m] [name_m]Jasper[/name_m] and [name_m]Otto[/name_m] [name_u]Emerson[/name_u] are my favorites! 
[name_m]Otto[/name_m] [name_u]Emerson[/name_u] is my favorite of your combos!