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).
Cesar
Cesar is now well below its former popularity. All-time it's been given to 79,139 U.S. babies, the 720th most common name by sound today, peaking at 2,538 in 2004, with 824 in 2025.
Cesar has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).