Update: This has now been solved.
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My great uncle was Jacob K. Udovich. He came to New Zealand in the early 1910s and adopted the gentile name 'Jack Mann', although he never made it official. He married my great aunt Liza Zam, who arrived to Wellington with my grandpa on the Rotorua in 1916. Jack and Liza married immediately; they were sweethearts in Crimea originally. They remained in Wellington for life where they had a series of grocery and garment manufacturing businesses. Jack is a bit of a man of mystery; although there's a picture of him in uniform there is no enlistment or service record. His immigration records cannot be found, and his death record cannot be located. All we know about him is that his father's name was Dov Ber Udovich and they were from Starodub, Russia where Jack was born in 1893. I notice in Ancestry.com the SCHNEIDER HOLLINGER and PAUL families have Jack in their online trees but we don't know what the connection is to these families. If anyone can make a connection, then great.