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).
Arlo
Arlo has been climbing in recent years. All-time it's been given to 25,135 U.S. babies, the 311th most common name by sound today, peaking at 2,574 in 2024, with 2,514 in 2025.
Arlo has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).