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).
Brooks has been climbing in recent years. All-time it's been given to 59,639 U.S. babies, the 146th most common name by sound today, at an all-time high of 4,965 in 2025.
Brooks has no common alternate spellings by sound.