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).
Troy
Troy is now well below its former popularity. All-time it's been given to 218,982 U.S. babies, the 927th most common name by sound today, peaking at 8,545 in 1970, with 563 in 2025.
Troy has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).