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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).
Monroe
Monroe has been climbing in recent years. All-time it's been given to 24,360 U.S. babies, the 827th most common name by sound today, peaking at 815 in 2025, with 815 in 2025.
Monroe has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).