What’s an Ulmo?

Ulmo is my username. It comes from the Silmarillion by J.R.R. Tolkien, in which Ulmo is Lord of Waters.

Nonetheless Ulmo loves both Elves and Men, and never abandonded them, not even when they lay under the wrath of the Valar. At times he will come unseen to the shores of Middle-earth, or pass far inland up firths of the sea, and there make music upon his great horns... But mostly Ulmo speaks to those who dwell in Middle-earth with voices that are heard only as the music of water. For all seas, lakes, rivers, fountains and springs are in his government; so that the Elves say that the spirit of Ulmo runs in all the veins of the world.