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).
Walker
Walker has been climbing in recent years. All-time it's been given to 48,951 U.S. babies, the 165th most common name by sound today, peaking at 4,408 in 2022, with 4,303 in 2025.
Walker has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).