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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).
Ford
Ford has been climbing in recent years. All-time it's been given to 11,026 U.S. babies, the 946th most common name by sound today, peaking at 707 in 2021, with 642 in 2025.
Ford has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).