I have Dargans in my family:
John Ed Dargan, Sr. m. Hannah? and had 8 children
John Ed Dargan, Sr. was born in Parish of Climbroney, Longford County, Ireland 17/Aug/1799 and died in Riceville, Iowa in 1901 (written in Wrigley's Believe it or Not for living in 3 centuries) and is burried in Cresco, IA
John Ed Dargan. Jr. m. Mary Ellen Conlin
had 11 children and ended up in IA and MN.