Firdaus or فردوس (Arabic) is an Arabic name come from words firdaws, a name for the highest paradise during hereafter. It's a loanword from
middle Persian just like
paradise which has
Persian root.This name belonged to Persian poet and historian,
Firdausi and he lived around eleventh century. Usually refer to masculine gender but sometimes also refer to feminine name.
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[Islamic] "Paradise". It constitutes the highest level of celestial bliss (spiritual perception). The word is of Persian origin. (Qur'an 18:107; 23:11)