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).
Titus
Titus is now well below its former popularity. All-time it's been given to 26,823 U.S. babies, the 725th most common name by sound today, peaking at 1,325 in 2015, with 910 in 2025.
Titus has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).