from where does the word 'wolf' come from?
From Old English.
Wolf
The English "wolf" stems from the Old English , which is itself thought to be derived from the Proto-Germanic . The Proto-Indo-European root *' may also be the source of the Latin word for the animal "lupus" 
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Wolf [SEP] Etymology
The English "wolf" stems from the Old English , which is itself thought to be derived from the Proto-Germanic . The Proto-Indo-European root *' may also be the source of the Latin word for the animal "lupus" (*'). The name "gray wolf" refers to the grayish colour of the species. Since pre-Christian times, Germanic peoples such as the Anglo-Saxons took on "wulf" as a prefix or suffix in their names. Examples include Wulfhere ("Wolf Army", or "He whose army is the wolf"), Cynewulf ("Royal Wolf"), Cēnwulf ("Bold Wolf"), Wulfheard ("Wolf-hard"), Earnwulf ("Eagle Wolf"), Wulfstān ("Wolf Stone") Æðelwulf ("Noble Wolf"), Wolfhroc ("Wolf-Frock"), Wolfhetan ("Wolf Hide"), Isangrim ("Gray Mask"), Scrutolf ("Garb Wolf"), Wolfgang ("Wolf Gait") and Wolfdregil ("Wolf Runner").