How to handle strings with commas in macros?

[William Denton]

I'm using macros to format names in a LaTeX export, like so:

#+latex_header: \newcommand\m[1]{\textsc{#1}}
#+macro: m \m{$1}

Thus

{{{m(William Denton)}}}

becomes

\m{William Denton}

on export and LaTeX will format it.  That works fine.  But in an index of names, 
if I want

{{{m(Denton, William)}}}

then Org takes that as two arguments to the macro, and outputs

\m{Denton}

Is there a way to get around this?

Thanks,

Bill

--
William Denton
https://www.miskatonic.org/
Librarian, artist and licensed private investigator.
Toronto, Canada