How to read the band →
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).
Cruz
Cruz climbed for decades and has been a steadily popular name ever since. All-time it's been given to 35,024 U.S. babies, the 628th most common name by sound today, peaking at 1,278 in 2013, with 1,040 in 2025.
Cruz has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).