Popularity in the United States (by decade)
Numbers
| Spencer (masculine) | Spencer (feminine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #332 | 0.054 | #1053 | 0.013 | ||
| 2010 | #266 | 0.069 | #1255 | 0.010 | ||
| 2000 | #146 | 0.129 | - | - | ||
| 1990 | #98 | 0.186 | #1321 | 0.007 | ||
| 1980 | #178 | 0.079 | - | - | ||
| 1970 | #285 | 0.040 | - | - | ||
| 1960 | #371 | 0.023 | - | - | ||
| 1950 | #419 | 0.015 | - | - | ||
| 1940 | #359 | 0.020 | - | - | ||
| 1930 | #422 | 0.016 | - | - | ||
| 1920 | #440 | 0.016 | - | - | ||
| 1910 | #410 | 0.020 | - | - | ||
| 1900 | #330 | 0.027 | - | - | ||
| 1890 | #326 | 0.025 | - | - | ||
| 1880 | #299 | 0.027 | - | - | ||
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