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]
Yuma Tourism: Best of Yuma. Yuma, Arizona. Once a busy river port sending military supplies shipped from California to forts and camps in the Southwest to fight the Apache wars, today Yuma is a winter retreat for thousands of visitors craving its warm, dry and sunny climate. With warm weather comes golf, and the city has several excellent courses.