What is "twardzik"

Twardzik is a surname. Notable people with the surname include:

• Dan Twardzik (born 1991), Czech footballer with Motherwell
• Dave Twardzik (born 1950), American basketball player
• Dick Twardzik (1931–1955), American jazz pianist
• Filip Twardzik (born 1993), Czech footballer with Celtic
• Patrik Twardzik (born 1993), Czech footballer with Livingston
• René Twardzik (born 1970), Czech retired footballer