Webster’s Revised Unabridged Dictionary · 1913
Sufi
Su′fi, n. [From the name of a dynasty of Persian kings, Safī, Safavī; said to come from name Safī-ud-dīn of an ancestor of the family, confused with sūfī pious.] A title or surname of the king of Persia.
Su′fi, n. [Ar. & Per. sūfī, wise, pious, devout.] One of a certain order of religious men in Persia. [Written also sofi.]