Most sources agree that ON vísundr is a loanword from West Germanic, but there is disagreement on the details. AEW says <- MLG. wisent, but compare also OHG. wisunt. "A non-IE word that passed into the different daughter languages independently" (GK).
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
De Vries, Jan (1977). Altnordisches etymologisches Wörterbuch. 3rd ed. Leiden: Brill
Robert Farren, PIE culture words collection, 2017
PK11, PK23, PK25
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