“Old name” in Japanese
Short answer
Old name in Japanese is “古称” (koshou). Full meaning: old name, former name.
Other ways to say “Old name” in Japanese
古名
komei old name, former name
旧称
kyuushou old name, former title
旧号
kyuugou old name, back number
旧名称
kyuumeishou former name, previous name, old name
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