Which two Japanese sound words form the name Pikachu?

The name Pikachu combines the Japanese sound words pika and chū.

Pika represents a sparkling or flashing sound, while chū represents the squeak of a mouse. Together, the name evokes Pikachu’s electric nature and mouse-like design. The name was chosen to work for audiences in both Japan and other markets.

Pikachu is classified as an Electric-type Pokémon and is recognized as the franchise mascot. Its yellow body, red cheek pouches, and lightning-bolt-shaped tail became some of the most recognizable visual features in popular video games.

The name is sometimes treated as if it were simply a translation of “electric mouse,” but it is more accurately built from Japanese onomatopoeia. Pikachu’s species description and design communicate the mouse idea, while the name itself reflects sounds associated with electricity and a mouse squeak.