Found this, which may provide a lead, while doing my own Tumman research at
http://surhelp-bin.rootsweb.com/sursrch.pl?surname=TUMMANTivnan/Todd/Tully/Tumman - Brady/Murphy/ Porteus/Gilrain/Parke
Posted by Jean Rice on Sun, 27 Dec 1998
Surname: Tivnan, Todd, Tully, Tumman, Brady, Murphy, Porteus, Gilrain, Parke
Please click on Surname List at top of this Co. Leitrim Queries website for additional information and queries. Please leave your own information here for other researchers. Thank you!
Co. Leitrim LDS (Mormon) Family History Center microfiched records:
1. Sally Tivnan born 14 Aug 1866 to John Tivnan and Elizabeth Brady, Kinlough.
2. Andrew William Todd born 30 Aug 1865 to Andrew William Todd and Catherine Murphy, Carrigallen.
3. Marriage, William Todd to Margaret Porteus, 14 Sept 1846, Inishmagrath Parish.
4. Michael Tully born 26 Sept 1865 to John Tully and Oney Gilrain, (?spelling of first name, please check computer record), Drumshanbo.
5. John Tumman born 21 June 1866 to Graims Tumman and Jane Parke, Newtown Gore.
Similar-sounding Co. Leitrim surnames include Tinnan, Tinnucon, Tivens, Tinmon, Tinnegar, Tippon, Tobin, Tolly, Tilly, Todwile, Toughall, Tottenham, Tolan, Talent, Tullach, Otley, Touhill, Toohill, Tuthill, Tall, Teal, Plott.