| CL | Constance Langdon | fictional character from American Horror Story |
| C | consulting | providing professional advice or sharing expertise; for business consulting or management consulting use Q130286 |
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Conway Twitty | American country singer (1933–1993) |
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Coraline Jones | fictional character from Coraline |
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Corbin Bernsen | American actor and director |
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Corey Harrison | American pawnbroker and television personality |
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Corey Lewandowski | American political operative and commentator |
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Cornelius van Til | Dutch-American philosopher and theologian |
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Corneliu Zelea Codreanu | Romanian fascist politician; leader of the Iron Guard between 1927–1938 (1899–1938) |
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Cosmo Jarvis | American actor and musician |
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Count Dracula | fictional character from Dracula |
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Count Orlok | fictional character from Nosferatu |
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Courtney Henggeler | American actress |
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Courtney Marie Andrews | American singer-songwriter |
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Coyote Peterson | American YouTuber |
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Craig Bierko | American actor and singer |
| CB | Craig Boone | fictional character from Fallout: New Vegas |
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Craig Federighi | American software engineer |
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Craig Kilborn | American TV show host |
| C"L | Craig "Seeker" Liddel | fictional character from Trainspotting |
| CT | Craig Tucker | fictional character from South Park |
| C | Cranberry | fictional character from Magical Girl Raising Project |
| CB | Credence Barebone | fictional character from Fantastic Beasts |
| C | crinacle | earphone and headphone reviewer |
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Cristina Fernández de Kirchner | president of Argentina from 2007 to 2015 |
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Croatia | country in Central Europe |
| C | Crush | fictional character from Finding Nemo |
| C | Crypto | fictional character from Apex Legends |
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Crystal healing | alternative medicine technique that employs stones and crystals |
| C1 | CSR 103.9 | fictional character from Grand Theft Auto: San Andreas |
| C | CT-NiTe | type on https://cognitivetype.com |
| C | CT-SiFe | type on https://cognitivetype.com |
| C | CT-SiTe | type on https://cognitivetype.com |
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Cubism | early-20th-century avant-garde art movement |
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Cui Tiankai | Chinese diplomat |
| C | Culprate | English musical artist |
| C | Curie | fictional character from Fallout 4 |
| CV | Current Value | German musician |
| CB | Cutler Beckett | fictional character from Pirates of the Caribbean: Dead Man's Chest |
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Cyn | American singer |
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Cyndi Lauper | American singer |
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Cynthia Erivo | British actress and singer-songwriter (born 1987) |
| C | Cypher | fictional character from The Matrix |
| C | Cypher | fictional character from Valorant |
| CDB | Cyrano de Bergerac | fictional character from Cyrano de Bergerac |
| C | Cyrus | fictional character from Octopath Traveler |
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Czech Republic | country in Central Europe |
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D4vd | American singer (born 2005) |
| DN | Daario Naharis | fictional character from Game of Thrones |
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Dacre Montgomery | Australian actor (born 1994) |