| X, Alfonso (1) | Xena (1) | XIII, Pope Leo (1) |
| X, Francis (1) | Xenocrates (1) | Xingjian, Gao (5) |
| X, Malcolm (9) | Xenophanes (5) | XV (30) |
| X-Files, The (1) | Xenophon (10) | XVI, Pope Benedict (10) |
| X-Files (1) | XI, Pope Pius (4) | Xx, Anon (1) |
| X2 (1) | Xiaoping, Deng (10) | XXIII, Pope John (19) |
| Xavier, St. Francis (1) | XII, Pius (1) | Xxxx, Anon (1) |
| Xavier, Francis (1) | XIII, Leo (1) | Xzibit (2) |