From the English animal name, used as a modern nature-inspired given name.
Otter comes directly from the English animal name and is used here as a modern nature-inspired given name. That makes it part of the contemporary trend toward names drawn from animals, landscapes, and the natural world rather than from saints or ancestors.
Otter has a playful, vivid image attached to it, which gives the name immediate personality. As a given name, Otter feels unconventional and distinctly modern. It is endearing, a little eccentric, and strongly visual, which can make it memorable.
Animal names often carry traits people associate with the creature itself, and otters suggest agility, curiosity, and liveliness. Otter is unusual enough to feel almost nickname-like, yet it works precisely because of its clarity and its charming natural image.