Pokrova (Ingrian) comes from Russian Покро́в, from Russian покры́ть, from Russian кры́ть, from Proto-Slavic kryti, from Proto-Balto-Slavic krū́ˀtei, from Proto-Indo-European krewH- — to cover, heap.
Pokrova (Ingrian): Intercession of the Theotokos