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Feliks is a masculine given name of Latin origin, derived from the Roman family name Felix. It means 'happy', 'lucky', or 'successful'. The name has been popular in many European countries, particularly Poland and Russia.
Both names have Slavic origins and a strong, classic feel, creating a harmonious sibling pairing.
Kaja shares the short, punchy quality of Feliks, with both names having a modern yet timeless appeal.
Both names are strong and masculine, sharing a similar sound and bearing a sense of power and nobility.