February 8, 2015 update2: Recently I asked blog friend Jake: “Who was Cobb?” A condensed response is as follows:
The Dutch, Swedes and later English originally settled the area. The Swedes named the creek, called Karakung by the Indians, Mill Creek. A number of mills were built along the creek, the oldest by the Swedes in 1642. It was renamed Cobb’s Creek after an early English settler, William Cobb.
Hence, it is Cobb’s Creek, with the apostrophe!