Here's stuff:

"In the Irish tradition concerning the Tuatha De Danaan, Oc, son and half-brother of the "All-father" Eochaid Ollathair known as "the Dagda," also has a half-sister Brigid (or Bride) and a half-brother known as Ogma, who is the great champion of the tribe. Ogma, half brother of 0g in Ireland, is the one who conveys on the Tuatha "Ogham," a pre-historic inscribed language found in various places in Great Britain. Off the west coast of Ireland, on several of the Arran Islands, are a number of "Oghil" place names , as well as the name "Achill," which Cohane calls "mixed," meaning it contains elements of both "0g" and "Ach," which seems to come from an allied but separate "Oc" tradition. There is also a statement in Irish mythology that the world will not end until "Ogham and Achu mix together and the sun and the moon mix together." Other Irish place names he cites are Avoca (Ava/Oca) and Aughaval (Og/Ava). St. Michael's Mount in Cornwall was known by the Romans as Ocrinum. "

http://www.spinninglobe.net/goddessnames.htm

Also..."many Ogbourne villages near Marlborough, the 0g river, tributary to the Kennet and the Ock river a few miles to the north"