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).
Skylar has dropped sharply from its peak but is still widely used. All-time it's been given to 180,735 U.S. babies, the 224th most common name by sound today, peaking at 7,737 in 2015, with 2,693 in 2025.
By sound, Skylar also includes the spellings Skyler, Schuyler.