1. UK (England/Nottinghamshire): formerly Niweweorce and Neuuerche 'New Work', that is, a fort from the Old English
nīwe and
weorc 'fortification' or 'building'. The full name of the town in Nottinghamshire is Newark-on-Trent, a reference to the river on which it lies.
2. USA (New Jersey): founded in 1666 as Pesayak Towne and later renamed New Milford after Milford, Connecticut. It was renamed again by the Revd Abraham Pierson, possibly after his hometown in England, Newark-on-Trent. An alternative suggestion is that it has a biblical connection: New Ark.
3. USA (Ohio): laid out in 1802 and named after the hometown of the first settlers, Newark, New Jersey.