Which spelling is better? It’s for a story, this is considering for a dystopian society that takes places 100-500 years from now. Thanks in advance 
[name_m]Ignasio[/name_m] is not a name, [name_m]Ignacio[/name_m] is. I think you’re mistaking [name_m]Ignasio[/name_m] with [name_m]Ignasi[/name_m], which is an catalonian name. [name_m]Ignacio[/name_m] is the spanish form. If it helps, [name_m]Nacho[/name_m] is the most common nickname for [name_m]Ignacio[/name_m]. [name_m]Trust[/name_m] me, I’m a spanish girl.
I would say them differently.
[name_m]Ignasio[/name_m] – “ig-nass-ee-o”
[name_m]Ignacio[/name_m] – “ig-nay-she-o”
I like [name_m]Ignacio[/name_m] more
In fact, [name_m]Ignacio[/name_m] is ''ig-nah-zee-oh" more or less.
And [name_m]Ignasi[/name_m] (not [name_m]Ignasio[/name_m]) is ‘ig-nah-see’
[name_m]Ignacio[/name_m] because [name_m]Ignasio[/name_m] is wrong.
[name_m]Ignacio[/name_m] because the other spelling is wrong.