Jewish great grandfather born Danzig, grandfather born Natz (near, part of Danzig?Gdansk). Anyone know Natz?

Question

Great grandfather was Jacob Prag, grandfather was Julius Prag. They came to England (Liverpool ) between 1856 and 1860. Julius later lived in Merthyr Tydfil, Glamorgan, and married Esther Goodman.

Answer 1

The only Natz I could find is at the opposite end of the (formerly) German speaking area, seen from Danzig: Natz (Italian: Naz) in South Tyrol/Alto Adige, since 1919 part of Italy.