Trying to get Q&A caught up, today. Welcome, new folks, and look what I found--this must be a really "holy" bird!
Old-time mariners called the bird Mother Carey's chicken, a derivation from mater cara, the Virgin Mary, a reference to its habit of walking on the water surface. The word petrel is derived from "Little Peter", a reference to St. Peter who was able to walk on water with Christ's help.
St. Peter

Bonus quiz: who knows (without looking it up) what pelagic means? (I just found out.)