There are a lot of towns named Franklin in the United States, but this one is actually named for Benjamin Franklin. It may be that some or most of the other Franklins are also named for Ben, but one can only read so many Wikipedia entries.
One major claim to fame of the area is the Delaware & Raritan Canal. At 22 miles long it was the busiest and most important canal that most people never heard of and is now the busiest state park and longest bike trail that many people don’t know.
Franklin Township Trivia: In the 1969 movie Hello, Dolly!, Dolly Levi (Barbra Streisand) lies in a scene in which she says that Cornelius Hackl is one of “The Hackls” and that they are actually rich and famous from his family helping to build the Raritan Canal.
Cargo was shipped down from the mines, across river, down to Trenton and up to New Brunswick, where it was ferried across the Raritan Bay to New York, and troops were transported via the canal during the Civil War.