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).
Regina
Regina has been climbing in recent years. All-time it's been given to 184,835 U.S. babies, the 723rd most common name by sound today, peaking at 5,019 in 1962, with 786 in 2025.
Regina has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).