Dr Sean McCartan is an authority on Irish history and in particular is the leading authority on the surname McCartan.
Email to Edward Cartin from Sean McCartan April 2002
"My interest in your surname was due to the similarity to 'McCartan'. This has caused confusion to many genealogists. Due to this, I became interested in the Dungiven, Claudy and Park area where the Cartin/en/an surname has a cluster. This needed lots more work but I found enough to conclude there was no connection with the Co. Down surname McCartan. "
For further information on the McCartans see: