The following is much of the information that I have collected on my MOON ancestors. This family immigrated from Cornwall, UK and began their lives in Simcoe County, Ontario, Canada in 1832
Don Hender has an interesting website the includes Cornish MOON families. His website is www.hunterscastle.com/moonhis.htm
Theophilus MOON, of Cornwall, England, and Honour/Honor HAWKEY who married around 1754, are the parents of 8 children including Robert MOON, the father of Henry John MOON and Edmund Joseph MOON who immigrated to Canada in 1832 (Honor's parents were Richard HAWKEY and Mary HOSKIN)
The children of Theophilus MOON & Honour HAWKEY were: Robt b 1755; Joseph b 1757; Margaret b 1758; Henry b 1750; Theophilus b 1762; Charles b 1765; Elizabeth b 1765; William b 1771
Robert Moon (above) c. 30 June 1755 St. Keyne, married
Henry John [A] and Edmund Joseph Moon [B] immigrated to Canada
I gave the designation [A] and [B] to these two immigrating brothers. Their children then have two-letter designations, eg [AA], [AB]... and [BA], [BB].. The third generation then have three-letter designations.
Updated 28 Jan 2012 - add a reference to Don Hender's MOON website