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Two items involving possible changes to name tags:

In the Isekai Maou to Shoukan Shoujo no Dorei Majutsu series, there is a character tagged with the romanized name of "Horun". In both the licensed English translation of the light novel and the second season of the anime (when she first appears) her name is romanized as "Horn".

In the Death March Kara Hajimaru Isekai Kyousoukyoku series, the MC is tagged with the name "Suzuki Ichirou". This is his name on Earth before being sent to the new world. In the new world, where virtually the entirety of the series takes place, he is known as "Satou", or "Satou Pendragon" as of volume 4 of the light novel. There is only a handful of characters in the new world who know the name "Suzuki Ichirou".