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).
Abraham is now well below its former popularity. All-time it's been given to 104,175 U.S. babies, the 434th most common name by sound today, peaking at 2,584 in 2016, with 1,664 in 2025.
Abraham has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).