Mael Fabhaill mac Cleireach
Mael Fabhaill mac Cleireach (died 887) was the King of Uí Fiachrach Aidhne in Ireland. Mael Fabhaill was one of the last kings of Aidhne who did not use a surname. His son and successor, Tighearnach Ua Cleirigh, did so and was ancestor to the family of Ó Cléirigh. Mael Fabhaill had a brother, Eidhean mac Cléireach, who gave his name to the Ó hEidhin family of south County Galway. References

 Irish Kings and High-Kings, Francis John Byrne (2001), Dublin: Four Courts Press, 
 Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork

Nobility from County Galway
9th-century Irish monarchs
887 deaths
Year of birth unknown