Thank you so much for all this information--I will watch for more as you put it on the web, and I'll let you know if I find out more. I have found that Scallon and Scallan are very rare, and I'm not sure if the two names are actually from the same root, despite the very similar spellings. I had once assumed that they were both variants of Scanlan, but now I'm not at all sure of that. I've also read that Scallon was once O'Scollain (a name found more in the North, I believe). Any light you can shed would be a big leap forward.