Bonk is a surname. It is a variant of the Polish surname Bąk ({{IPAc-pl|ˈbɔŋk}}), which has several meanings, including Botaurus (a genus of birds in the heron family), horse-fly, child, and bumblebee. Notable people with the surname include:

• Bartłomiej Bonk (born 1984), Polish weightlifter
• Charles S. Bonk (1920–1976), American businessman and politician
• Gerd Bonk (1951–2014), German weightlifter
• {{Interlanguage link multi|Grzegorz Bonk|pl}} (born 1977), Polish footballer
• Hugo Bonk (1861-1936), German historian
• James Bonk (1931–2013), American chemist and academic
• John Bonk (born 1950), 2008 inductee into the Canadian Football Hall of Fame
• Julia Bonk (born 1986), German politician
• Keiko Bonk (born 1954), Hawaiian activist, artist, musician and politician
• {{Interlanguage link multi|Leon Stanisław Bonk|pl}} (1919–1943), Polish sergeant in World War II
• Radek Bonk (born 1976), Czech professional ice hockey player
• Tino Bonk (born 1967), German bobsledder

• Cadwaladr ap Cadwallon of Gwynedd
• Cadwaladr Fendigaid
• Cadwaladr Fendigaid ap Cadwallon
• Cadwaladr Fendigiad ap Cadwallon
• Cadwaladr (name)
• Cadwallader Colden
• Cadwallader C Washburn
• Cadwallader C. Washburn
• Cadwallader David Colden
• Cadwallader D. Colden
• Cadwallon
• Cadwallon ab Ieuaf
• Cadwallon ap Cadfan
• Cadwallon ap Cadfan of Gwynedd
• Cadwallon ap Einion
• Cadwallon Lawhir
• Cadwallon Lawhir ap Einion
• Cadwell, GA
• Cadwell, Georgia
• CADW (Welsh Heritage) Properties in Wales
• Cady Cantrell
• Cady Huffman
• Cady McClain
• Cady Way Trail
• Cady, WI