Konstantin

Konstantin "Kostya" Tszyu (Russian: Константин «Костя» Цзю) is a Russian Australian former professional boxer who competed from 1992 to 2005. He held multiple light-welterweight world championships, including the undisputed and lineal titles between 2001 and 2005. Tszyu was an exceptional all-around boxer-puncher who relied heavily on accuracy, timing, and carried formidable punching power; he is often regarded as one of the hardest-punching light-welterweights in the division's history.

Konstantin (1827-1892) was the son of Emperor Nicholas I of Russia and his wife Alexandra Feodorovna.

Grand Duke Konstantin Pavlovich Romanov (1779-1831), son of Emperor Paul I of Russia and younger brother of Aleksandr I of Russia.

Konstantin Levin is a famous character in Leo Tolstoy's novel "Anna Karenina".

Constantine the Great of the Byzantine empire should qualify. :)

This spelling of Konstantin (Constantine) is often used for the character in Chekov's play "The Seagull." Konstantin is a tragically unsuccessful writer who shoots himself. All that aside, I love this spelling and this name--the Russian nickname being "Kostya."

Konstantin Stanislavski was the Russian actor & director who started what became known as "method acting", taught to many American actors in New York by most notably Lee Strasberg & Stella Adler.