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Last name origins & meanings:

1. Polish, Czech, and Eastern German: from a pet form of any of various personal names beginning with Pa-, for example local forms of Paul or any of the Old Slavic names represented by Czech Pačeslav and Polish Pakosław (see Pacek).
2. German: from a pet form of the personal name Bartholomäus (see Bartholomew).
3. South German: variant of Bach.