I’m going back and forth with boy names.
I have a son named [name_m]Nicholas[/name_m] [name_m]Alejandro[/name_m] nickname [name_u]Nico[/name_u].
My favorites are [name_m]Mateo[/name_m], [name_m]Lorenzo[/name_m], [name_m]Luciano[/name_m] , [name_m]Maximo[/name_m] and [name_m]Julian[/name_m].
I will include my favorite combinations. Please let me know which one flows better with [name_m]Nicholas[/name_m].
[name_m]Mateo[/name_m] [name_m]Benjamin[/name_m], [name_m]Mateo[/name_m] [name_m]Joaquin[/name_m]
[name_m]Lorenzo[/name_m] [name_m]Julian[/name_m], [name_m]Lorenzo[/name_m] [name_m]Joaquin[/name_m]
[name_m]Luciano[/name_m] [name_m]Benjamin[/name_m]
[name_m]Maximo[/name_m] [name_m]Joaquin[/name_m], [name_m]Maximo[/name_m] [name_m]Julian[/name_m]
[name_m]Julian[/name_m] [name_m]Mateo[/name_m], [name_m]Julian[/name_m] [name_m]Francisco[/name_m]
[name_m]Julian[/name_m] [name_m]Francisco[/name_m].
Since [name_m]Nicholas[/name_m] is common in a lot of languages and doesn’t automatically make you think of Spanish, I think you need to pick another than that is similar, so out of your list - [name_m]Julian[/name_m].
Picking Fancisco is more personal preference than anything. I think having n and then M does sound slightly odd, but not enough for you not to pick it is you prefer [name_m]Mateo[/name_m] to Fancisco.
[name_m]Mateo[/name_m] [name_m]Benjamin[/name_m]
[name_m]Julian[/name_m] [name_m]Mateo[/name_m]
[name_m]Mateo[/name_m] [name_m]Joaquin[/name_m]
[name_m]Julian[/name_m] [name_m]Mateo[/name_m]
[name_m]Maximo[/name_m] [name_m]Joaquin[/name_m] is my favorite with [name_m]Nicolas[/name_m] [name_m]Alejandro[/name_m]. [name_u]Nico[/name_u] and [name_u]Max[/name_u] seem like natural brothers with similar popularity and flair.
I like them all! My favorites are [name_m]Julian[/name_m] [name_m]Francisco[/name_m] and [name_m]Mateo[/name_m] [name_m]Benjamin[/name_m], and I’d love to see [name_m]Lorenzo[/name_m] [name_m]Benjamin[/name_m] or [name_m]Benjamin[/name_m] [name_m]Lorenzo[/name_m], [name_m]Benjamin[/name_m] [name_m]Joaquin[/name_m], [name_m]Benjamin[/name_m] [name_m]Mateo[/name_m], [name_m]Benjamin[/name_m] [name_m]Luciano[/name_m], and [name_m]Benjamin[/name_m] [name_m]Andres[/name_m]. 
If I had to pick one, it would easily be [name_m]Julian[/name_m] [name_m]Francisco[/name_m]–I love it!–but I really love the idea of [name_m]Lorenzo[/name_m] or [name_m]Benjamin[/name_m] more–I just wasn’t as crazy about your [name_m]Lorenzo[/name_m] combos, and you don’t have [name_m]Benjamin[/name_m] as a FN option this time around.