I'm from the Pacific Northwest of the US and I say it with the S sound and I've never pronounced it with the Z sound except when spelled
Josef.
I've never paid much attention before but I more often pronounce
Josiah with the Z sound but sometimes I say it with the S sound.
Josephine I more often say with an S sound but I also sometimes pronounce it with the Z sound.
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Favorite Names:
Aurora,
Frida,
Dorothea,
Althea,
Josephine,
Vivian,
Hazel,
Fiona,
Willemina,
Delphina,
Cordelia,
Clara,
Elaina,
Aveline,
Artemis,
Luna,
Leona
Rowan,
Adrian,
Cassidy,
Magnus,
Merrick,
Rainier,
Cedar,
Quinton,
Ciaran,
Arthur,
Malcolm,
Tristan,
Robin,
Cedric,
Gavin,
Kestrel,
Peregrine