Popularity in the United States (by decade)
Numbers
| Clifford (masculine) | Clifford (feminine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #1330 | 0.008 | - | - | ||
| 2010 | #1256 | 0.007 | - | - | ||
| 2000 | #945 | 0.009 | - | - | ||
| 1990 | #497 | 0.021 | - | - | ||
| 1980 | #245 | 0.050 | - | - | ||
| 1970 | #199 | 0.069 | - | - | ||
| 1960 | #159 | 0.098 | - | - | ||
| 1950 | #112 | 0.145 | - | - | ||
| 1940 | #101 | 0.170 | - | - | ||
| 1930 | #86 | 0.213 | #1572 | 0.002 | ||
| 1920 | #65 | 0.275 | #1143 | 0.004 | ||
| 1910 | #63 | 0.301 | #1017 | 0.004 | ||
| 1900 | #63 | 0.276 | #940 | 0.005 | ||
| 1890 | #70 | 0.219 | #918 | 0.005 | ||
| 1880 | #97 | 0.132 | #771 | 0.006 | ||
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