| 2431 | January 6 | Birth | 1899 – Phyllis Haver, American actress (d. 1960) |
| 2432 | January 6 | Birth | 1899 – Heinrich Nordhoff, German engineer (d. 1968) |
| 2433 | January 6 | Birth | 1900 – Maria of Yugoslavia (d. 1961) |
| 2434 | January 6 | Birth | 1902 – Helmut Poppendick, German physician (d. 1994) |
| 2435 | January 6 | Birth | 1903 – Maurice Abravanel, Greek-American pianist and conductor (d. 1993) |
| 2436 | January 6 | Birth | 1903 – Francis L. Sullivan, English-American actor (d. 1956) |
| 2437 | January 6 | Birth | 1905 – Idris Davies, Welsh poet and author (d. 1953) |
| 2438 | January 6 | Birth | 1907 – David Fleay, Australian ornithologist and zoologist (d. 1993) |
| 2439 | January 6 | Birth | 1908 – Menachem Avidom, Hungarian-Israeli composer (d. 1995) |
| 2440 | January 6 | Birth | 1910 – G. N. Balasubramaniam, Indian singer-songwriter (d. 1965) |
| 2441 | January 6 | Birth | 1910 – Wright Morris, American author and photographer (d. 1998) |
| 2442 | January 6 | Birth | 1910 – Yiannis Papaioannou, Greek composer and educator (d. 1989) |
| 2443 | January 6 | Birth | 1912 – Jacques Ellul, French philosopher and critic (d. 1994) |
| 2444 | January 6 | Birth | 1912 – Danny Thomas, American actor and producer (d. 1991) |
| 2445 | January 6 | Birth | 1913 – Edward Gierek, Polish politician (d. 2001) |
| 2446 | January 6 | Birth | 1913 – Loretta Young, American actress (d. 2000) |
| 2447 | January 6 | Birth | 1914 – Godfrey Edward Arnold, Austrian-American physician and academic (d. 1989) |
| 2448 | January 6 | Birth | 1915 – Ibolya Csák, Hungarian high jumper and gymnast (d. 2006) |
| 2449 | January 6 | Birth | 1915 – Don Edwards, American soldier, lawyer, and politician (d. 2015) |
| 2450 | January 6 | Birth | 1915 – John C. Lilly, American psychoanalyst, physician, and philosopher (d. 2001) |
| 2451 | January 6 | Birth | 1915 – Liisi Oterma, Finnish astronomer (d. 2001) |
| 2452 | January 6 | Birth | 1915 – Alan Watts, English-American philosopher and author (d. 1973) |
| 2453 | January 6 | Birth | 1916 – Eugene Thomas Maleska, American journalist (d. 1993) |
| 2454 | January 6 | Birth | 1916 – Vincent Serventy, Australian ornithologist and author (d. 2007) |
| 2455 | January 6 | Birth | 1917 – Koo Chen-fu, Taiwanese businessman and diplomat (d. 2005) |
| 2456 | January 6 | Birth | 1919 – Roy Cochran, American hurdler and sprinter (d. 1981) |
| 2457 | January 6 | Birth | 1920 – John Maynard Smith, English biologist and geneticist (d. 2004) |
| 2458 | January 6 | Birth | 1920 – Doris Stokes, English psychic (d. 1987) |
| 2459 | January 6 | Birth | 1920 – Early Wynn, American baseball player, coach, and sportscaster (d. 1999) |
| 2460 | January 6 | Birth | 1921 – Marianne Grunberg-Manago, Russian-French biochemist and academic (d. 2013) |