Umchaka etymology?

[David Robertson]

This inquiry came to me today, and I thought someone on this list might 
have an idea about the word in question, since Moberly / Moberley Lake is 
an area where Saulteaux / Ojibwe people live.  I'll forward any 
responses.  --  Dave R.

"We received a call into our office today concerning the native language 
(if it is) of the word "umchaka".  It originates in Northeastern BC around 
Moberley Lake (according to the fellow who is related to the individuals 
who used this word).  Do you know?"

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