Popularity in the United States (by decade)
Numbers
| Kai (masculine) | Kai (feminine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #82 | 0.228 | #772 | 0.020 | ||
| 2010 | #150 | 0.129 | #908 | 0.016 | ||
| 2000 | #263 | 0.059 | #1259 | 0.009 | ||
| 1990 | #652 | 0.013 | #1689 | 0.005 | ||
| 1980 | #945 | 0.005 | - | - | ||
| 1970 | #1092 | 0.003 | - | - | ||
| 1960 | #1349 | 0.002 | - | - | ||
| 1950 | - | - | - | - | ||
| 1940 | - | - | - | - | ||
| 1930 | - | - | - | - | ||
| 1920 | - | - | - | - | ||
| 1910 | - | - | - | - | ||
| 1900 | - | - | - | - | ||
| 1890 | - | - | - | - | ||
| 1880 | - | - | - | - | ||
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