Ayub Bey (August 23, 1968 – December 13, 2022), known as Grand Daddy I.U., was an American rapper who was a member of the hip-hop group Juice Crew in the 1980s.

[1] Grand Daddy I.U., born in Queens, was raised in Hempstead, Long Island, and encouraged to begin performing by his older brother, also known as Kay Cee.

In 1990 he released his debut, Smooth Assassin, which spawned two Rap Chart hits: "Something New" (#11) which sampled James & Bobby Purify's "I'm Your Puppet", and "Sugar Free" (#9).

He became noted for his high-end tailored attire, always appearing in public wearing a suit and tie.

continued to do production work in hip-hop for Das EFX, Heltah Skeltah, KRS-One, and Ice-T among others.

He issued a third album, Stick to the Script, in 2007, featuring production from Large Professor and Marco Polo and appearances from 2Pac, DV Alias Khryst, and Pudgee Tha Phat Bastard.

In 2017 he reunited with long-time collaborator Pudgee Tha Phat Bastard on the album Still Hear by Long Island emcee Lantz.