Mag Shamhradháin is the original Irish Gaelic form of the surname McGovern. Both are derived from the Old Irish personal name Samhradhán, which means "summer" (a diminutive of samhradh, "summer"). The Gaelic prefix Mac (son of) was altered in Irish to Mag before a broad consonant, hence Mag Shamhradháin is a reduced form denoting "son of Samhradhán". During the first millennium AD, Ireland was peopled by dozens of clans and septs—patrilineal family groupings named after a common ancestor. The bearer of the original name Samhradhán would have been a personal name or nickname, possibly describing the man's disposition or the season of his birth. Under the Tudor conquest (1540s–1600s) and subsequent plantations, Gaelic names were systematically anglicized; thus Mag Shamhradháin was adapted into McGovern and Govern. The surname remains concentrated in Ireland, especially in counties Cavan, Leitrim, and Fermanagh, where the McGoverns were historically septs governing the territory of Teallach-Eachdhach (Tullyhaw). According to the genealogical manuscripts (e.g., the Great Book of Lecan), the McGoverns descend from the monstrous dark age kings of Connacht. The etymological root samhradh means "summer" in Old Irish, and is cognate with Welsh haf and Latin aestas. The given name Samhradháin, along with its modern version McGovern and reduced forms like Gov and Guir, can also be found in spelling variants like Mag Shamhráin. Meaning: "son of Samhradháin", from the Gaelic personal name Samhradhán meaning "summer" Origin: Irish Gaelic Type: Patronymic surname Usage regions: Ireland (mainly Cavan, Leitrim, Fermanagh), with scattered diaspora worldwide