Like many Jews in the Russian empire, Rav Shmuel Leib changed his surname to appear as an only child, to avoid service in the Tsar's army.
Why, of all names, did he choose Horwitz? Does this suggest that he perhaps knew of a connection he had to Levitical Horwitz family, whom the Shlah HaKadosh is of?
I would be interested to hear others' thoughts.