I don't know where you live, but come summer, your plant would assuredly appreciate a vacation outdoors in lots of sun, after it's acclimated, of course. ;o) Good luck, O. Al

Camaassia? Here is a link that might be useful: Camassia with white flowers

Dinky picture but inflorescence certainly has the characteristic outline. Strap-like leaf shape might come from a Zantedeschia rehmanii involvement.

Nandina domestica.