Nahaaygm Łagyigyedm, or Spirit of Our Ancestors, sits ashore One Tree Island outside of Metlakatla. (Hunter Morrison/KRBD) About a dozen people were holding cedar boughs last Saturday in a driveway on the outskirts of Metlakatla. Seated atop a nearby trailer was a long, white canoe with a red and black formline design painted on the bow. David Nelson, whose Native name translates to Strong Voice of the Steersman, grabbed his drum and began sing…