Geni points to the 1901 census which shows his first names as Zev Woolf, but almost everywhere else the second name is shown as Wolf, as it is in the 1890 entry in the marriage register. The 1901 census has good information, and this one difference is not a reason to ignore it.
Note though that the 1901 census also shows that he stated his place of birth ("Where born") as Austria, while the 1890 entry in the marriage register shows that he came from Dombrowa in Galicia.