Since we humans have developed the ability to be in contact with the spirit world, we have given names to what we have seen. The first names were given to the spirits of the elements and that isn’t different in the Norse tradition. One of the most powerful fire-spirits of the Norse mythology is called Logi. Mythology says that Logi is the second son of the frost giant called Mistblindi or sometimes called Fornjotr. The eldest brother of Logi is a Norse deity called Kari, the god of the northern winds. The youngest brother is Aegir, the king of the sea, older than Njörd.
One of the most heard tales of the adventures of the Norse gods is the one when Thor and Loki go into Utgard and enter different contests with Utgardens-Loki, trying to win against many family members and friends of Utgard-Loki, in a series of random contests. In this story, Logi the fire spirit appears, entering the food contest against Loki and winning. No one knew who he was, but he devoured the meal, the bones, the plates and even the table. Later he was revealed as Logi the old god of fire.
One of Logi’s names is Halogi, meaning “High-Logi”, it seems that this spirit is very tall. Logi’s wife is Glut (glow) and she bore him two daughters so called Einmyria and Eisa, translating to “Ashes” and “Embers”. Logi, of course, lives in Muspelheim, the realm of fire.
As it is seen many times in both norse mythology and celtic, there are many deities that come in three, a magical triplicity, such as Odin and his two brothers Vili and Vé, with Logi we also see this magical triplicity with his own brothers and himself, Kari the eldest, Logi and Aegir the youngest, Wind, Fire and Water (sea). These deities are really old, older than Odin. It is possible that there three deities might be linked to the myth of creation, a myth that predates the Aesir and the Vanir.
Logi and his two brothers make the triplicity of the primal elements working in earth, as the sea (water) itself interacts with the earth, and of course the fire and wind that help shaping worlds. These deities no doubt were once linked to the magical quadriplicity of the natural elements of fire, air, earth and water, in a time before the creation of the myth of Odin, in a time before we humans gave an anthropomorphic shape to the spirits.