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).
Murphy
Murphy has been climbing in recent years. All-time it's been given to 13,174 U.S. babies, the 703rd most common name by sound today, peaking at 1,124 in 2025, with 1,124 in 2025.
Murphy has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).