Kaj (/kaɪ/), pronounced “kai,” originates as a Danish form of the Latin name Gaius, historically borne by Roman statesmen and early Christian figures. Its root meaning—loosely associated with “rejoice”—imparts a quiet optimism to its crisp, single-syllable structure. While most common in Denmark and across Scandinavia, Kaj also appears in German and Polish records, occasionally serving as a diminutive of Kajetan. In English-speaking contexts it is regularly rendered as /kaɪ/, sparing it the mispronunciations that more elaborate names endure. In the United States, Kaj first entered Social Security data in the 1950s and has maintained a modest foothold ever since, most recently ranking 909th in 2024 with 15 recorded births. This understated yet enduring presence makes Kaj an attractive choice for parents seeking a succinct name rooted in European tradition, free from passing fads.
| Kaj Riska - | 
| Kaj Munk - | 
| Kaj Ulrik Linderstrøm-Lang - | 
| Kaj Gynt - | 
| Kaj Leo í Bartalsstovu - | 
| Kaj Pindal - | 
| Kaj Sundberg - | 
| Kaj Chydenius - | 
| Kaj Allan Olsen - | 
| Kaj Stenvall - |