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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).
Royalty
Royalty has been climbing in recent years. All-time it's been given to 7,751 U.S. babies, the 998th most common name by sound today, peaking at 980 in 2019, with 375 in 2025.
Royalty has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).