Finnian or Finian
I definitely prefer it with two!
[name_m]Finnian[/name_m] gets my vote
[name_m]Finnian[/name_m] just looks right to me. 
[name_m]Finnian[/name_m] looks more complete to me.
I prefer [name_m]Finnian[/name_m]!
Two Ns look complete!
Another vote for [name_m]Finnian[/name_m]! Nothing wrong with [name_m]Finian[/name_m], but [name_m]Finnian[/name_m] is the more intuitive spelling for me (and works best in case you want the nn Finn) 
I prefer it spelt Finnian!
[name_m]Finnian[/name_m] looks lovely and balanced in my opinion!
[name_m]Finnian[/name_m]!
[name_m]Finnian[/name_m] it is. That’s what I prefer too.
[name_m]Finnian[/name_m] looks the most complete to me!
i think it looks better with two!
Finnian, for sure !!
[name_m]Finnian[/name_m] looks nicer to me
Definitely two N’s! 
[name_m]Finnian[/name_m] looks more complete to me
I prefer [name_m]Finnian[/name_m]!
I prefer [name_m]Finnian[/name_m], [name_m]Finian[/name_m] looks a little incomplete to me.