Zak Arogundade Gaterud (born 23 October 1994), professionally known as Ecco2k, and also stylized as Ecco2K, ECCO2K, and Ecco²k, is a Swedish recording artist, visual artist, fashion designer, graphic designer, and record producer born in London, England, and based in Stockholm.

At age five, Ecco had already taken a liking to music, designing logos and album covers for imaginary bands he made up. In 2006, at the age of twelve, he and his classmate Bladee formed their own punk rock band named Krossad. The two would release their debut CD, Jävla äckel, one year later.

Ecco is a member of the musical collective Drain Gang, also known as Gravity Boys Shield Gang, and is closely affiliated with Yung Lean and Sad Boys. Even though he is definitive within the group, his style is mysterious, due to the limited number of tracks he has released.

His debut album E was released on 27 November 2019—an experimental set of songs executively produced by a close friend and longtime collaborator Gud.

Notably, Ecco is a self-sufficient artist, producing most of his own music, creating his own cover art, and directing as well as editing his own music videos. He has also directed and edited music videos for another fellow avant-garde artist, Yves Tumor. He is the founder of the fashion brand g'LOSS—a Drain Gang merchandise line—and a former designer for the Swedish label and cult footwear brand Eytys.