Sufis are commonly described by the terms dervish and faqir, both of which are associated with the idea of religious mendicancy and spiritual devotion. The term “Sufi” itself has been given several possible etymological explanations. Some scholars derive it from the Arabic word suf, meaning “wool,” possibly referring to the simple woollen garments traditionally associated with ascetic practitioners. Others connect it with safā, meaning virtue, purity, or spiritual refinement, or with safwa, meaning “the chosen” or “the select.”
These proposed derivations reflect different attempts to explain the origins and meaning of the term, but they should not be treated as equally established historical facts. Some alternative and more allegorical interpretations also exist, although their historical value is more speculative. The variety of proposed explanations therefore illustrates the complexity of tracing the origins of the term “Sufi” and the traditions associated with it.
To read the complete outline by Thorsten Koch, MA, PgDip: