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).
Glenn
Glenn was more common in the past and has since settled at a lower, steady level. All-time it's been given to 383,209 U.S. babies, the 1,816th most common name by sound today, peaking at 10,332 in 1962, with 198 in 2025.
By sound, Glenn also includes the spellings Glen, Glynn, Glin.
Rising