Jack means Gods Mercy. This form of the name John, was popular in the Low countries in the middle ages and was used in stories, Jack and the Beanstalk, Jack Sprat (nursery rhyme). Nicknames tend to pick up on personal traits, so whatever you think is appropriate, loving, cute but not too embarrassing or unmanly.
Yuma, Arizona. Yuma (Cocopah: Yuum) is a city in and the county seat[5] of Yuma County, Arizona, United States. It is located in the southwestern corner of the state, and the population of the city was 93,064 at the 2010 census, up from the 2000 census population of 77,515.[3]
Roll is an unincorporated community in central Yuma County, Arizona, United States. It is part of the Yuma Metropolitan Statistical Area. Named for early settler John H. Roll, it lies along the lower Gila River, between the Yuma Proving Ground and the Barry M. Goldwater Air Force Range. Local roads connect Roll to Interstate 8, east of the city of Yuma, the county seat of Yuma County. Its elevation is 262 feet (80 m). Although Roll is unincorporated, it has a post office. Roll has the ZIP Code of 85347; in the 2000 census, the population of the 85347 ZCTA was 1,235.