The Soghain were a people of ancient Ireland. The 17th-century scholar Dubhaltach Mac Fhirbhisigh identified them as part of a larger group called the Cruithin. Mac Fhirbhisigh stated that the Cruithin included "the Dál Araidhi [Dál nAraidi], the seven Lóigisi [Loígis] of Leinster, the seven Soghain of Ireland, and every Conaille that is in Ireland."
The locations of four of the seven Soghain are as follows:
The Soghain of Connacht were located in the ancient kingdom of Soghan, an area in central east County Galway bounded by the river Suck on the east, the river Clare on the west, the Grange and Shiven rivers to the north, and the Raford and Ballinure rivers to the south. A poem recorded in The Book of Uí Maine, Cruas Connacht clanna Sogain, lists the kingdom's boundaries, which can be found to tie in with the above locations:
From Áth an Ibar westTo Glais Uair ArnaighWas the extent of SoghanThat sword-guarded land. From Béal na Róbe in MáenmaghTo the clear, soft-reeded SiminWas the breath of the plainWhich bore no ignominy.
The previous, pre-Gaelic people of the area were called the Senchineoil. Very little information survives on them.
The Soghain of Connacht were described by Seán Mór Ó Dubhagáin in his poem Triallam timcheall na Fodla as follows: "The six Sogain let us not shun / Their kings are without oblivion / Good the host of plundering excursions / To whom the spear-armed Sogain is hereditary."
The Book of Lecan lists their six branches as Cenél Rechta, Cenél Trena, Cenél Luchta, Cenél Fergna, Cenél Domaingen and Cenél Déigill.
The genealogy of Saint Kerrill of Clonkeenkerrill is given as Caireall mac Curnáin mac Treana mac Fionnchada mac Náir mac Earca mac Tiobraide mac Soghain Salbhuidhe mac Fiacha Araidhe. His grandfather, Treana mac Fionnchada, was the eponym of the Cinel Trena, who were apparently located close to Knockma, as evinced by the placename Tír Mhic Trena (the land of the sons of Trena). This area was the western limit of the kingdom of the Connacht Soghain.
Early Christian evangelists among the Soghain included Conainne, St Connell and Kerrill. Their successors include Naomhéid, Cuana of Kilcoonagh, Dubhán, Felig, Íbar, Íomar of the Sogain, Laisren of Clonkeenkerrill, Maol Chosna, Modiúit, Menott, Molua of Kilmoluagh.
Parishes known to be included in Soghan were:
Soghan became subject to the Uí Maine sometime during the first millennium.
Descendants of the Soghain are still found in great numbers in County Galway, bearing names such as Ó Mainnín, Mannion, Manning, Ward / Mac an Bhaird, Gill / Gillane, Scarry, Dugan / Duggan, Megan / McGann, Martin, and Cassain.