Please read Alexey Sklyarenko's annotations on Pale Fire, Ada and other Nabokov works here.
Describing his rented house, Kinbote (in VN’s novel Pale Fire, 1962, Shade's mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) mentions Alphina, the youngest of Judge Goldsworth’s four daughters: