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).
Stella
Stella is down from its peak but still widely used. All-time it's been given to 207,288 U.S. babies, the 159th most common name by sound today, peaking at 5,164 in 2018, with 4,136 in 2025.
Stella has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).