| 2821 | January 7 | Birth | 1800 – Millard Fillmore, American soldier, lawyer, and politician, 13th President of the United States (d. 1874) |
| 2822 | January 7 | Birth | 1827 – Sandford Fleming, Scottish-Canadian engineer, created Universal Standard Time (d. 1915) |
| 2823 | January 7 | Birth | 1831 – Heinrich von Stephan, German postman, founded the Universal Postal Union (d. 1897) |
| 2824 | January 7 | Birth | 1832 – James Munro, Scottish-Australian publisher and politician 15th Premier of Victoria (d. 1908) |
| 2825 | January 7 | Birth | 1834 – Johann Philipp Reis, German physicist, invented the Reis telephone (d. 1874) |
| 2826 | January 7 | Birth | 1837 – Thomas Henry Ismay, English businessman, founded the White Star Line Shipping Company (d. 1899) |
| 2827 | January 7 | Birth | 1844 – Bernadette Soubirous, French nun and saint (d. 1879) |
| 2828 | January 7 | Birth | 1845 – Ludwig III of Bavaria (d. 1921) |
| 2829 | January 7 | Birth | 1856 – Charles Harold Davis, American painter (d. 1933) |
| 2830 | January 7 | Birth | 1858 – Eliezer Ben-Yehuda, Belarusian lexicographer and journalist (d. 1922) |
| 2831 | January 7 | Birth | 1860 – Emanuil Manolov, Bulgarian composer (d. 1902) |
| 2832 | January 7 | Birth | 1864 – Seo Jae-pil, South Korean-American journalist and activist (d. 1951) |
| 2833 | January 7 | Birth | 1870 – Gordon Hewart, 1st Viscount Hewart, English judge and politician 7th Lord Chief Justice of England (d. 1943) |
| 2834 | January 7 | Birth | 1871 – Émile Borel, French mathematician and politician (d. 1956) |
| 2835 | January 7 | Birth | 1873 – Charles Péguy, French poet and journalist (d. 1914) |
| 2836 | January 7 | Birth | 1873 – Adolph Zukor, Hungarian-American film producer co-founded Paramount Pictures (d. 1976) |
| 2837 | January 7 | Birth | 1875 – Gustav Flatow, German gymnast (d. 1945) |
| 2838 | January 7 | Birth | 1875 – Thomas Hicks, American runner (d. 1963) |
| 2839 | January 7 | Birth | 1876 – William Hurlstone, English pianist and composer (d. 1906) |
| 2840 | January 7 | Birth | 1877 – William Clarence Matthews, American baseball player, coach, and lawyer (d. 1928) |
| 2841 | January 7 | Birth | 1879 – John Bissinger, American gymnast (d. 1941) |
| 2842 | January 7 | Birth | 1880 – Jerome Steever, American water polo player (d. 1957) |
| 2843 | January 7 | Birth | 1885 – Edwin Swatek, American swimmer and water polo player (d. 1966) |
| 2844 | January 7 | Birth | 1887 – Oskar Luts, Estonian author and playwright (d. 1953) |
| 2845 | January 7 | Birth | 1888 – Vera de Bosset, Russian-American ballerina (d. 1982) |
| 2846 | January 7 | Birth | 1891 – Zora Neale Hurston, American anthropologist and author (d. 1960) |
| 2847 | January 7 | Birth | 1895 – Hudson Fysh, Australian pilot and businessman co-founded Qantas Airways Limited (d. 1974) |
| 2848 | January 7 | Birth | 1895 – Clara Haskil, Romanian pianist (d. 1960) |
| 2849 | January 7 | Birth | 1896 – Arnold Ridley, English actor and playwright (d. 1984) |
| 2850 | January 7 | Birth | 1898 – Robert LeGendre, American pentathlete (d. 1931) |