Meaning and history
From Japanese 健 (ken) meaning “healthy, strong” or 研 (ken) meaning “study, sharpen,” combined with 二 (ji) meaning “two,” this name can also be written with other combinations of kanji characters.
20062006: 99 births, rank #1,519
2007: 108 births, rank #1,477
2008: 145 births, rank #1,211
2009: 159 births, rank #1,148
2010: 119 births, rank #1,399
20112011: 147 births, rank #1,198
2012: 124 births, rank #1,359
2013: 125 births, rank #1,352
2014: 96 births, rank #1,619
2015: 122 births, rank #1,406
20162016: 125 births, rank #1,399
2017: 137 births, rank #1,314
2018: 141 births, rank #1,294
2019: 156 births, rank #1,218
2020: 245 births, rank #910
20212021: 281 births, rank #845
2022: 337 births, rank #754
2023: 296 births, rank #827
2024: 284 births, rank #854
20252025: 249 births, rank #943
Kenji moved from #856 to #944 for boys between 2024 and 2025. Its highest annual birth count came in 2022, with 337 births.