Delphin is an archaic word for /dolphin that simply comes from the Albanian language. Everithing that comes from non-greek or non-roman sources are fantasia most of the official linguistic sources say. And there is an official etymology for this word. What I am gooing to explain here has nothing to do with the etomology. It has to do with the origin of the language. The dolphins have a very specific feature. Dolphins jump in the water when traveling because they use less energy jumping than swimming, because water is more dense than air. Dolphins also jump to find food, similar to how birds look for fish above the water. In addition, they will jump to scare a school of fish, which then pack tighter into a group, and the dolphin can catch several at once. Dolphins communicate with other dolphins by jumping and become particularly acrobatic during mating season. Male dolphins often do complicated spins and flips, perhaps to attract females, or to show dominance that keeps other males