Kalvaitis (Kalvaitytė, Kalvaitienė) is a Lithuanian-language surname derived from the word kalvis, "blacksmith". It was Polonized as Kailoweit, Kallwejt, Kalwajt, Kalwajtys, Kałwajtys, Kalweit, Kallweit, Kalwejt.Apokalipsy bałtyckich światów / The Apocalypses of the Baltic Worlds, 2017, , p. 428 Notable people with this surname include:
(born 1927), Lithuanian ballet dancer and teacher (1842-1900) one of the first Lithuanian professional musicians and composers Paulina Radziulytė-Kalvaitienė (1905 – 1986), Lithuanian athlete and basketball player Paulina Kalvaitytė, a founder of the Lithuanian Women's Council
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