Šulc is pronounced as German/English Schultz. The English version would be something like Shoultz (where "shou" is pronounced as in should).
For the female form, the last name is spelled Šulcova.
Listen to Blanka Lednická as she pronounces Šulc and Šulcova:
Vaclav Sulc and Marie Kopalova (Kopal) - Family Group Sheet
Vaclav was a peddler and shopkeeper.