PENGUIN

Nadie está completamente seguro de por qué los pingüinos se llaman pingüinos

The name pen gwyn originally applied to the great auk, an enormous flightless black-and-white seabird of the North Atlantic, and it's presumed that sailors to the South Atlantic either confused the flightless black-and-white seabirds they saw there for auks, or just used the same word for both creatures.