Somers, Summers, Sommers
Somers, Summers, Sommers—These three names, collectively according to locality, are the anglicised forms of O'Samhraidh in North Munster and S.E. Leinster; Mac Samhraidh in Mayo; Mag Shamhráin (M'Govern and M'Gauran) in Cavan, Leitrim, and S. Monaghan.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees