[Reikou]

Not sure if it was already reported or not, or even what triggered it, but two of my youkai decided to name themselves after deciding they were tired of their default names.

After being killed/unsummoned they reverted back to normal.

[Joseph Jostar]

From what I've heard, they seem to occasionally take on the names of other players' youkai.

[Neus]

Might be related to the examine issue, shouldn't happen in the next version.