I've been able to trace my Livingston County Marr line back a couple more generations. Jessie Marr (b. ca. 1824, d. 8 Nov 1874) was the son of John Marr (b. 1800, Mt Bethel, PA) and Esther Noble (b. Markham, Ont. Canada).John was the son of John Marr of PA and Barbara Brooks of Markham, Ont.This is as far as I've been able to go back, but I have an interesting article from the Detroit Genealogical Research Society newsletter describing a Marr Family Convention in 1874 that took place in Lansing, MI that gives names of attendees from several states.