Hi Try looking for records in Middlesex, Monmouth and Somerset Counties.. Have come across a lot of Suydams in my research in those counties. Try looking for cemetery records. Sometimes you can get a lot of info. Did find under 1860 US Mortality Schedule under Bernards Twsp: Cornelius C Suydam 59 m., Dec, Physician Could this be your child Cornelius? Under Somerset Co Gravestones - Peapack Dutch Reformed Churchyard found : William Suydam; wife Mary A Lowery 1843-1907 Shirley