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).
Pablo climbed for decades and has been a steadily popular name ever since. All-time it's been given to 50,439 U.S. babies, the 796th most common name by sound today, peaking at 1,174 in 2006, with 743 in 2025.
Pablo has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).