Joost Theo Sylvio Yussef Abdelgalil Dowib, known professionally as Josylvio (born April 14, 1992), is a Dutch rapper.
Josylvio, born in Naarden to a Dutch mother and an Egyptian father, he started his career in 2015 under the name Jaybay. In 2015, he released the single "Le7nesh" with Sevn Alias. With success of the song, he released the album Ma3seb with Dutch hip hop producer Esko. The album reached number 5 of the Dutch Album Top 100 and earned him an Edison nomination. He released a number of singles that reached the Single Top 100, including in collaboration with other rappers, such as Ali B, Hef, Adje, Jairzinho, Kevin and others.
In 2017 Josylvio became part of the album All Eyez on Us album project with Latifah, Kempi, Sevn Alias, Vic9 and Rocks. The joint album was inspired by the documentary film All Eyez on Me about Tupac Shakur and a tribute to him. And in 2018, Josylvio took part in RTL reality program Expeditie Robinson in its 19th season finishing 18th.