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).
Jensen has climbed over the years and is holding near its high. All-time it's been given to 23,144 U.S. babies, the 544th most common name by sound today, peaking at 1,435 in 2019, with 1,428 in 2025.
By sound, Jensen also includes the spellings Jenson.