Vocabulary What does 月光 (げっこう, gekkou) mean? 月光 (げっこう, gekkou) means moonlight; moonbeam. Quick factsReadingげっこうRomajigekkouPart of speechnoun 月光げっこうgekkoumoonlight; moonbeam1noun moonlight; moonbeamKanji in this word月month; moon光light, ray