Popularity in the United States (by decade)
Numbers
| Kathy (feminine) | Kathy (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | - | - | - | - | ||
| 2010 | #1584 | 0.007 | - | - | ||
| 2000 | #845 | 0.015 | - | - | ||
| 1990 | #561 | 0.022 | - | - | ||
| 1980 | #350 | 0.038 | - | - | ||
| 1970 | #134 | 0.138 | - | - | ||
| 1960 | #40 | 0.535 | #1608 | 0.001 | ||
| 1950 | #22 | 0.800 | #1427 | 0.001 | ||
| 1940 | #88 | 0.233 | - | - | ||
| 1930 | #594 | 0.011 | - | - | ||
| 1920 | #1977 | 0.002 | - | - | ||
| 1910 | - | - | - | - | ||
| 1900 | - | - | - | - | ||
| 1890 | - | - | - | - | ||
| 1880 | - | - | - | - | ||
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