Very surprised that a certain individual from this parish did not post in this thread.
The name Ogham or Ogam was derived from that of the Celtic god of literature and eloquence, Ogma, who is credited with it's invention. Ogma has the epithets "honey mouthed" and "eloquent".
He has been linked with the Gaulish God Ogmios
whose "golden speech" was recorded in Gallic artwork as a fine gold chain linking the tip of his tongue to ears of a group of followers