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).
Navy
Navy has been climbing in recent years. All-time it's been given to 6,717 U.S. babies, the 689th most common name by sound today, peaking at 1,045 in 2025, with 1,045 in 2025.
Navy has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).