Vocabulary What does 一人っ子 (ひとりっこ, hitorikko) mean? 一人っ子 (ひとりっこ, hitorikko) means (an) only child. Quick factsReadingひとりっこRomajihitorikkoPart of speechnoun 一人っ子ひとりっこhitorikko(an) only child1noun (an) only childAlso written: ひとりっ子、独りっ子、一人子Kanji in this word一one; the number 1人person子child