Where does “sesepa” come from?

sesepa (Tswana) comes from Afrikaans seep, from Dutch zeep, from Middle Dutch seep, from Old Dutch sēpa, from Frankish saipā, from Proto-Germanic saipǭ, from Proto-Indo-European seyb- — to pour, leak, trickle; to pour out, trickle,...

sesepa (Tswana): soap