I presume this to be a relic of Norman-French origin (see also Sinclair for St. Claire). Its spelling is not set in stone, I believe the forms Sinjin, Sinjun and Sinjon have been found. The name has no 'meaning' in and of itself, but its usage is typically in honor of St. John the Baptist or St. John the Evangelist.
Stack Name Meaning. English: nickname for a large, well-built man, from Middle English stack 'haystack' (from Old Norse stakkr). The surname is now less common in England than in Ireland (especially County Kerry), where it was first taken in the 13th century; it has been Gaelicized Stac. German: variant of Staack.
In English the meaning of the name Stacey is: resurrection; or of Eustace: fruitful.
Transferred use of the surname, which is a variant of the English Starling. It is derived from the Old English stærling (a starling, a type of bird) and arose as a nickname in reference to the bird. Modern use of the name often equates it to the vocabulary word sterling (silver; of excellent quality).
Swedish Meaning: The name Staffan is a Swedish baby name. In Swedish the meaning of the name Staffan is: crowned with laurels'.
The German name Staffen, was formed from the given name Steffen, which comes from the Greek "Stephanos," meaning "crown."
Stafford Name Meaning. English: habitational name from any of the various places in England so called, which do not all share the same etymology. The county seat of Staffordshire (which is probably the main source of the surname) is named from Old English stæð 'landing place' + ford 'ford'.
Stahley Name Meaning. Americanized form of South German and Swiss Stäheli or Stähli, from a diminutive of Middle High German stal 'steel', 'armor' (see Stahl).
Stamatis Name Meaning. Greek: from a personal name based on medieval Greek stamato 'stop' (a derivative of classical Greek histemi), an omen name expressing the wish of parents to stop giving birth to girls, or given to a boy after the death of older siblings and meaning 'stop dying'.
English Meaning: The name Stamford is an English baby name. In English the meaning of the name Stamford is: From the stony ford.
