Yčas is a Lithuanian surname. The Dictionary of Lithuanian surnames suggests that it is an abbreviation of a baptismal name, but unclear which one, cf. Bulgarian Ичo/Ицо from Христо or Илия.Surname database; entries based on Lietuvių pavardžių žodynas, (ats. red. A. Vanagas, autoriai A. Vanagas, V. Maciejauskienė, M. Razmukaitė). Vilnius: Mokslas, 1985, T. 1; 1989, T. 2. Notable people with the surname include:
Jonas Yčas (1880–1931), pedagogue, state and public figure, professor, pioneer of national historiography, evangelical reformer Martynas Yčas (1917–2014), American microbiologist of Lithuanian descent (1885–1941), Lithuanian public figure, lawyer, politician, publicist, editor, and statesman
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