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).
Iker
Iker is now well below its former popularity. All-time it's been given to 18,928 U.S. babies, the 746th most common name by sound today, peaking at 2,176 in 2015, with 815 in 2025.
Iker has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).