The name "Abegg" is actually A-B-E-G-G, and that's the main theme in the melody. (Plays the notes A, B, E, G and G) That comes from the last name of one of Schumann's female friends.
Название « Абегг » — на самом деле ноты A-B-E-G-G — это главная тема мелодии.