Baby name dilemma

Stephanie
We are having baby #4 and our first 3 children have names that start with 's' - do we have to keep with the 's' theme or can we stray? I know it's our decision, I just want an opinion. If we stick with 's' what named go well with 
Sydney
Saylor
Sutton 
Off limits = sawyer, Sullivan, Sadie, Sophie, sage.