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).
Israel climbed for decades and has been a steadily popular name ever since. All-time it's been given to 77,596 U.S. babies, the 504th most common name by sound today, peaking at 2,111 in 2007, with 1,151 in 2025.
By sound, Israel also includes the spellings Isreal.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).