Hession (pronounced "hesh + in") is an old Connacht Irish surname. It is an Anglicized form of the Irish Ó hOissín. In Irish, it is pronounced "O + hush + een". It appears to originate in Co. Galway and in County Mayo. The Hession surname is predominantly found in these counties in the Census of Ireland, 1911. It denotes descent from a person named Oisín, a personal name meaning "little deer", and the name of the poet and warrior of the fianna in Irish mythology. Áed Ua hOissín was the name of two Irish clerics in the 11th and 12th centuries - the coarb of St. Jarlath (1050) and the first Archbishop of Tuam (1152) respectively. George Petrie who unearthed the High cross at Tuam which bears an inscription Áed Ua hOissín wrote that he was assisted by a gentleman of the name O'Heshin who litt