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).
Beckett has been climbing in recent years. All-time it's been given to 30,530 U.S. babies, the 346th most common name by sound today, peaking at 2,625 in 2025, with 2,625 in 2025.
Beckett has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).