Unami Creek is a 16.5-mile-long tributary of Perkiomen Creek in Lehigh, Bucks, and Montgomery counties in eastern and southeastern Pennsylvania. Unami Creek is named for the Lenape's Unami language. The creek originates in Lower Milford Township in Lehigh County, Pennsylvania and then crosses into Milford Township and Marlborou…Unami Creek is a 16.5-mile-long tributary of Perkiomen Creek in Lehigh, Bucks, and Montgomery counties in eastern and southeastern Pennsylvania. Unami Creek is named for the Lenape's Unami language. The creek originates in Lower Milford Township in Lehigh County, Pennsylvania and then crosses into Milford Township and Marlborough Township, and joins Perkiomen Creek near Perkiomenville. It was formerly called Swamp Creek. The name now applies to the current day West Swamp Creek.