The most likely contenders for the location of his birthplace are either Echizen or Hagi City, Nagato Province (the family line of the SUGIMORI is historically the retainer of the Mori clan, whose feudal land was in Nagato Province) but there are other contenders including Karatsu City in Hizen Province or Yodo domain.
出生地については越前説と長門国萩市（もともと杉椙氏は毛利氏家臣の系統である）が有力な説となっているが、肥前国唐津市、淀藩説など他にも諸説がある。