Looking at Wikipedia - the surname DENEHY mainly comes from Cork & Kerry

http://www.en.wikipedia.org/wiki/Dennehy

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As on Daniel's death certificate - occupation Teamaker (on Public Members tree on Ancestry - his father's name was Thomas)** his mother's maiden name is unknown, but was Irish as was Thomas.

? Would Ellen's death certificate have the father's name and mother's maiden name stated

Ancestry - Ireland, Civil Registration Marriages Index 1845 - 1958 have a Thomas DENEHY marriages - one in 1853
for Dublin South - 5 males listed and 4 women.

Is the Denehy a Catholic family - and therefore the marriage/birth records are not on line?

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*** (Ancestry Public members tree)

Listed are the children of Daniel & Ellen DENEHY - as family names are more often than not a clue

Thomas A - 1885-1963

Margret (Maggie) - 1890

Margret - 1891

Daniel J - 1895

John Paul Garrett - 1895-1973

Ivor Ellen - 1898

Leonard - 1903-1917

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Margret would seem to be a family name and Garrett might be a christian/surname - Ivor is a Welsh name