If you use a nickname for San Jose, you probably use San Jo. Some people use Man Jose, a name given because of the perception that San Jose has either too many men, or not enough women. According to this list here, a longer nickname for San Jose is “The Capital Of Silicon Valley.”
Some other fun local nicknames are “Surf Ciy, USA” for Santa Cruz, “Crossroads of Silicon Valley” for Milpitas, “The Orchard City” for Campbell, and “Garlic Capital of the World” for Gilroy.
– Chris Jackson (proud to be born and raised in San Jo)