Žydrūnas

Žydrūnas is also used as a feminine name in Lithuanian, alongside Žydrė. However, Žydrūnas is more common for males. So, I think that the "Gender" of this name should be changed from "Masculine" to "Masculine & Feminine".

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Sources: https://www.names.org/n/zydrunas/about
https://forebears.io/x/forenames/zydrunas

There is not such name as Zydrumas in Lithuanian, I think it's a mistake, the name is originaly Zydrunas, with N and not M. [noted -ed]