The name “Pikachu” combines the Japanese sounds pika and chū.
Pika represents a sparkling or flashing sound, while chū represents the sound associated with a mouse. Together, the two onomatopoeic elements evoke Pikachu’s electric nature and its classification as a mouse Pokémon.
The name was designed to work for audiences in both Japan and the United States. Creating a name that sounded appealing and could travel across languages was reportedly a difficult part of Pikachu’s development. The Japanese spelling is ピカチュウ, commonly romanized as Pikachū.
Pikachu’s name is sometimes interpreted as a literal translation of “electric mouse,” but that is not what the Japanese construction means. Pikachu is an Electric-type Pokémon whose design includes red cheek sacs, a lightning-bolt tail, and yellow fur; the name’s sound effects reinforce those traits rather than directly translating them.