There is a character who bears this name in the point and click adventure game "Broken Age," developed by Double Fine. Although, it's just a nickname as his real name is "Marekai".
Marek Střeštík is a Czech footballer who currently plays for MTK Budapest, he is half Czech and half Hungarian; his father is ethnic Czech, his mother is Hungarian. Beside Czech, Střeštík also speaks Hungarian and Slovak on a native level.
Marek Židlický is a Czech professional ice hockey player currently an unrestricted free agent who last played with the New York Islanders of the National Hockey League (NHL). He was selected in the sixth round, 176th overall, by the New York Rangers in the 2001 NHL Entry Draft.
Marek Jankulovski is a retired Czech footballer who played as a defender. His most notable achievements include winning the UEFA Champions League with A.C. Milan and being voted the 2007 Czech Footballer of the Year. He earned 77 caps for the Czech Republic, and represented them at three European Championships, the 2000 Olympics and the 2006 World Cup.
Marek Hamšík is a Slovak professional footballer who plays as an attacking midfielder and serves as the captain for Italian club Napoli, and the Slovakia national team, for which he is vice-captain.
Marek Kaščák is a Slovak footballer who plays for 1. HFK Olomouc. Kaščák made his national team debut in a 1–2 home defeat against Denmark on 29 March 2011.