Can a person have a webbed neck without it being related to a syndrome? s.o. has one but was never officially diagnosed with anything. were nervous to have kids if its potentially an issue?

Although present with some chromosome abnormalities, it can appear as a sporadic process. Some of these carry a label in various circles. I suggest you find a clinical geneticist, often found at medical schools or children's hospitals. They can review the family history on both sides, create a family tree and give you a realistic risk profile for any issue of concern.