I may be able to help - may - my grandmother left me a handwritten 1918 genealogy she and her father, James O'Sullivan of Knocknagashel, Kerry, Ireland. Most of the information - I only have very grainy copy - is unable to be be verified as in most cases records didn't exist.
[I hired and paid 500 euros to an idiot genealogist who promised to find my Kerry ancestors but was more interested in writing her book and gave me NO helpful information and actually proved she knew nothing.]
There was ALOT of intermarriage between my O'Sullivans, Keane's, O'Connors, Murphy's, Walsh's - I am still trying to untie all of them.