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).
Olivia
Olivia climbed for decades and has been a steadily popular name ever since. All-time it's been given to 608,776 U.S. babies, the 4th most common name by sound today, peaking at 21,758 in 2014, with 14,282 in 2025.
By sound, Olivia also includes the spellings Alivia, Alyvia.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).