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Some of the below are guesses:

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Krabat: Middle low German for Croat. Nicknames and surnames derived from nationality or ethnicity were common.
Tonda: short for Antonín.
Andrusch: from Andrew.
Lyschko: no idea.
Staschko: from Stanislav, see Staszko/Staszek/Staś.
Kubo: short for Jakub, see Kuba.
Witko: short for Wit, see Witold.
Lobosch: no clue, maybe related to the word luby (beloved in many Slavic languages)?
Pamphutt: MAYBE (very large maybe!) related to the Finnish pamputtaa, meaning "to strike (with a stick)"? Could be a nickname for a rowdy or agressive character?
Jirko: short for Jiří (George).
Kantorka: strange nickname, but etymology is probably right.
Worschula: no clue.
Milenka: short for Milena, also means "lover" (as in female sexual partner) in Czech.
Raduschka: short for Rada.
Duschenka: variant of Dušanka.

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masculine list: https://www.behindthename.com/pnl/191050/124079
feminine list: https://www.behindthename.com/pnl/191050/124080