Cai is a brisk, one-syllable traveler that roams comfortably across cultures: in the English-speaking world it echoes “kai,” while in Mandarin it lands closer to “ts-eye,” and each sound carries its own luggage of meaning. To Welsh storytellers, Cai is the modern spelling of Sir Kay, King Arthur’s shrewd yet loyal foster brother; to Chinese speakers, it can be written with characters for “victory,” “color,” or “wealth,” depending on parental hope and calligraphic flourish. The name’s lean form and gender-neutral stance give it a contemporary sparkle, yet its passport is centuries old—proof that brevity need not be a modern invention. In American nurseries, Cai hovers politely around the 800-rank mark, averaging fewer than a hundred births a year; it is uncommon enough for playground distinctiveness, but familiar enough to spare a lifetime of spelling lessons. Like a pocket compass, Cai points in several meaningful directions at once: literary, global, quietly adventurous. Parents who choose it often do so for the promise that their child, no matter the path, will carry a name both lightweight and quietly luminous—proof that sometimes the smallest packages travel farthest.
| Cai Xukun, known as Kun, is a Chinese singer-songwriter and actor who rose to fame on Idol Producer and led the boy group Nine Percent. |
| Cai Guo-Qiang is a Chinese artist known for his gunpowder art and fireworks displays, including those at the 2008 Beijing Olympics. |
| Cai Yuanpei was a Chinese philosopher and education reformer who led Peking University and founded Academia Sinica. |
| Cai Yan, also known as Wenji, was a Chinese poet, composer, and writer of the late Eastern Han dynasty. |
| Cai Haoyu, also known as Hugh Tsai, is a Chinese businessman and video game producer best known for co-founding miHoYo. |
| Cai Yun is a Chinese badminton legend who won Olympic gold in 2012 and four world titles in men's doubles. |
| Cai Jing was a Chinese calligrapher and four-time chancellor of the Northern Song dynasty, later portrayed as a villain in Water Margin. |
| Cai Chusheng was a pioneering Chinese film director who earned China's first international film award with Song of the Fishermen in 1934. |
| Cai Jin is a Chinese painter best known for her oil paintings of banana plants. |
| Cai Ming is a Chinese singer and actress known for her sketch comedy performances. |
| Cai Xiao was a Taiwanese military officer and politician who served on the Chinese Communist Party Central Committee and led the Taiwan Democratic Self-Government League. |
| Cai Qirui was a Chinese chemist and educator known as the founder of Chinese catalytic chemistry. |
| Cai Zhenhua is a former Chinese table tennis player who later led several national sports associations. |
| Cai Fuchao is a Chinese journalist and politician who served as vice mayor of Beijing and led national media and propaganda agencies. |
| Cai Evans is a Welsh rugby player who plays fly half for the Dragons and the Wales national team. |