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).
Eugene
Eugene is now well below its former popularity. All-time it's been given to 383,340 U.S. babies, the 1,537th most common name by sound today, peaking at 9,827 in 1927, with 249 in 2025.
Eugene has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).