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Does anyone know what does "Mathonwy" means? I do know that "Math ap" is something like "Coin/treasure/money son of" where the following part is "Mathonwy" another name for his father according to one of the versions regarding this celtic character's parentage... I guess it would be something like "--- coin/treasure/money ---" but I fail to find the meaning of "onwy"... Any help will be apreciated.