Maher is a sum of money agreed to in a Muslim wedding contract. In
case of divorce the man gives this to the woman. If the wedding was
done in Canada have there been any cases that recognize this amount to
be paid to the woman in addition to the splitting of the assets as per
standard canadian family law?

Here is something to start with.  Apparently in Ontario, a couple can
define that they are marrying under Sharia law:
http://www.ccmw.com/MuslimFamilyLaw/submission%20made%20to%20Ms%20Marion%20Boyd.htm

You can find the answer to your question here <A
href="http://www.marriage-contract.ca/blog/2006/04/03/does-canadian-family-law-uphold-maher">here</A>.