Parashurama felt impure after the destruction of the Kshatriyas and needed brahmins for the rite of purification.
He brought a narrow strip of land out of the sea, today’s Konkan, the coastal region of Maharashtra, and took the bodies of 14 brahmins that had washed ashore after a shipwreck, burned them and brought them back to life.
They are the Chitapavan Brahmins, purified (Pavan) by the pyre (Chita), the fire. They are the progenitors of 14 gotras.
Read about Chitapavan Brahmins here