2: Ciarán Ó Dubhghaill -New Name (NP)
<Ciarán >Given name found in "Index of Names in Irish Annals." by Kathleen M. O'Brien. Version 2.2, updated 24 August 2007
Middle Irish Gaelic (c900-c1200) nominative form ranging from 512 to 1061 found 10 times.
<O Dubhghaill> Dubhghaill is the genitive form Early Modern Irish Gaelic (c1200-1700) found 980, 1268
Found via "Index of Names in Irish Annals." by Kathleen M. O'Brien. Version 2.2, updated 24 August 2007
Clan affiliation by name is structured
The standard way to form a name using an Irish clan affiliation byname for men is: <single given name> Ó «eponvmous clan ancestor's name (in genitive case)
"Quick and Easy Gaelic Names" by Sharon L. Krossa htto://medievalscotland.org/scotnames/quickgaelicbynames/#clanaffiliationbyname