Where does “Saint John’s” come from?

Saint John’s (English) comes from English Saint John — Any of the saints named John (including John the Baptist).

Ancestry of “Saint John’s”, step by step

Saint John’s traces back through two separate lines of ancestry.

via English Saint John

StepLanguageWordMeaning
1EnglishSaint JohnAny of the saints named John (including John the Baptist)

via English St. John's

StepLanguageWordMeaning
1EnglishSt. John's
Every word from English Saint John