I know this is hypothetical, but still wanted to throw this out there. [name_f]My[/name_f] son’s name is [name_m]Sullivan[/name_m] and when I introduce him people think I said [name_m]Solomon[/name_m] much more often than I thought would happen. So if you have siblings named [name_m]Sullivan[/name_m] and [name_m]Solomon[/name_m] it’s fairly likely that it would get very confusing who you’re actually talking about.
[name_f][/name_f]To answer your question, I’d stick with the S theme at that point! Having 3 S names and having the fourth be something different feels off to me. I’d stick with it!