It does make more sense to me that way, but I'm
Dutch and KSAHN-dər is how it's pronounced for us.
After clicking on it I see that is slso says it with an S- in
Dutch, but I've NEVER heard it used in
Dutch like that (we use
Sander for that), so I'm not sure how that got there.
But in English words with an X- start often start with a Z- sound, so some people might need some extra instruction to pronounce your son's name correctly.