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Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Derek
Derek is now well below its former popularity. All-time it's been given to 435,859 U.S. babies, the 373rd most common name by sound today, peaking at 13,174 in 1989, with 2,053 in 2025.
By sound, Derek also includes the spellings Derrick, Derick, Dereck, Darrick, Derik, Deric, Derrek.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).