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).
Harlow
Harlow has been climbing in recent years. All-time it's been given to 16,655 U.S. babies, the 546th most common name by sound today, peaking at 1,455 in 2023, with 1,148 in 2025.
Harlow has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).