Support for non-standard fonts and weights?

In my project, I need to export a DOCX file with the body text as "Avenir" with its "Light" weight. In some cases, I know it's referred to as "Avenir Light" or "Avenir-Light." However, every variation of the font style I try ends up resulting in Arial in the final Word Doc.

Any ideas on what I'm doing wrong?

Code

$phpWord->addFontStyle('cFStyle', array(
    'name' => 'Avenir-Light'
));
[...]
$section->addText('Building a culture of engagement and philanthropy', 'cFStyle');

Results

Final Word 2007 Doc has all text set as Arial (though it shows "cFStyle" as the body style).

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PHPOffice / PHPWord

Support for non-standard fonts and weights? #611