OK, had a few minutes this evenin so I thought I'd research my own question
Pretty cool stuff !
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Etymology -
The name implies a diet of fish yet it seldom dines on aquatic organisms. Early Dutch settlers noted its similarity to the European polecat (Mustela putorius).
Fitchet is a name derived from the Dutch word
visse which means
'nasty' 
In the French language, the pelt of a polecat is called
fiche or fichet.[8]
In some regions the fisher is known as a
pekan, derived from its name in the Abenaki language.
Wejack was derived from otchoek (Cree) and
otochilik (Ojibwa) by fur traders. Other American Indian names for the fisher are
tha cho (Chippewayan), meaning "big marten", and
uskool (Wabanaki).[8]
http://http://en.wikipedia.org/wiki/Fisher_(animal)