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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).
Octavia
Octavia has been climbing in recent years. All-time it's been given to 24,117 U.S. babies, the 620th most common name by sound today, peaking at 1,238 in 2021, with 982 in 2025.
Octavia has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).