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).
Alina has been climbing in recent years. All-time it's been given to 83,026 U.S. babies, the 225th most common name by sound today, at an all-time high of 3,487 in 2025.
By sound, Alina also includes the spellings Alena, Aleena, Elina, Alyna.