Crossword clues for the word: OGAM The word OGAM has appeared as an answer to at least 9 crossword clues on different crossword puzzles. Crossword clues for OGAM Showing 1 to 9 of 9 results Clue(s) Ancient Irish tongue Early Irish writing system. Irish script Irish writing Old Celtic alphabet: Var. Old Irish alphabet: Var. Old Irish script Old Irish tongue: Var. Old Irish writing system.