FYI - I just posted Thomas Munnelly's history today (8/1). It's extensive, detailed and includes an account of the origins of the Munnellys and the name. Thomas has a lot of knowledge of the Munnellys in northwest Mayo - including where many of the families emigrated (ie: specific places in England, Australia, West Virginia, Pennsylvania, Chicago, Massachusetts, and Montana).
I hope you'll take a look and see if you might be connected!!
Go to www.munnellysofcountymayo.com
and click on the 'Histories' tab - then look for Thomas Munnelly.