Such childhood names were in use primarily from the Heian through to the Edo periods for the children of military or noble families during their childhoods, and most often ceased to be used once the child passed through the coming of age ceremony and received his imina (real name) for adulthood.
主に平安時代～江戸時代にかけて、武士や貴族の子が幼児である期間につけられる名前で、だいたい元服して諱をつけるまでその名前でいる。