The wisdom of Sholom Aleichem seems to apply here.
Avram: "He's right? AND He's right?-How can they both be right?" Tevye: "You know, you are also right."
Apparently, Holingz ed or Holin shed or Holins head are all correct.
I assume the name is derived from what seems to be its original form:
Hollings head, or 'hollingz hed' or 'hollingz ed'. One encyclopedia spells it Holinshed, but indicates it phonetically as hol inz -hed. Two different dictionaries show both the names (Hollingshead & Holinshed) to be interchangeable in usage, pronunciation , and spelling. --depends, I guess, on which district of old Luddstown you happen to find yourself in at the moment--or sometimes, as was noted by The Inimitable Boz , which block.