Kassimou D'Jae, better known by his stage name Alonzo, is a French rapper and singer of Comorian descent who is signed to Def Jam France.

He started rapping from 2002 onwards and was part of the Marseille-based hip hop band Psy 4 de la Rime as Segnor Alonzo alongside band members Don Vincenzo (real name Illiassa Issilame), Soprano (real name Saïd M'Roubaba) and DJ Sya Styles (real name Rachid Aït Baar).

His 2010 solo album Les temps modernes won critical acclaim. His 2012 album Amour, gloire & cité (aka AG&C) contains collaborations with a number of artists like Kenza Farah, Makiavel, Soprano, L'Algérino, M.o.h & Fahar, and Kalif Hardcore.