member of a Muslim mystical order, 1650s (earlier Sufian, 1580s), from Arabic sufi, literally "man of wool" (i.e., "man wearing woolen garments," as opposed to silk), from suf "wool." According to Klein, so-called from the habit of "putting on the holy garment" (labs-as-suf) to devote oneself to mysticism. Related: Sufic.
word-forming element making nouns implying a practice, system, doctrine, etc., from French -isme or directly from Latin -isma, -ismus (source also of Italian, Spanish -ismo, Dutch, German -ismus), from Greek -ismos, noun ending signifying the practice or teaching of a thing, from the stem of verbs in -izein, a verb-forming element denoting the doing of the noun or adjective to which it is attached. For distinction of use, see -ity. The related Greek suffix -isma(t)- affects some forms.
<a href="https://www.etymonline.com/word/sufism">Etymology of sufism by etymonline</a>
Harper, D. (n.d.). Etymology of sufism. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/sufism