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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).
Helena
Helena has been climbing in recent years. All-time it's been given to 40,412 U.S. babies, the 822nd most common name by sound today, peaking at 841 in 2025, with 841 in 2025.
Helena has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).