People

prince

Source:*kъnędzьProto-Slavic · “from Germanic *kuningaz 'king'”certain

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English

prince

Polish

książę

ˈkɕɔ̃ʐɛ

CognateSame source — the sound laws connect them.

In all five languages

BCS script

Latin under Cyrillic

Russian
князьknjazʹ
knʲasʲinherited
Ukrainian
князьknjazʹ
knʲazʲinherited
Polish
książę
ˈkɕɔ̃ʐɛinherited
Polish ksiądz, from the same word, means 'priest'.
Czech
kníže
ˈkɲiːʒɛinherited
Czech kněz, from the same word, means 'priest'.
Bosnian-Croatian-Serbian
knezкнез
knezinherited
English
prince
English shares this source: king — An early Slavic loan from the Germanic word that became English king.