What are the sources of diglycerides and monoglycerides? Can they be a by-product of soap manufacturing?

To put it differently,
could the ones used in food be from pork origin?
To put it differently, could the ones used in food be of pork otigin?

Monoglycerides. Glycerides. (See Glycerin.) Diglycerides.
From animal fat. In margarines, cake mixes, candies, foods, etc. In cosmetics. Alternative: vegetable glycerides

This is the definition of monoglycerides and diglycerides according to happycow.net hidden animal ingredient list.

Here is the link: http://www.happycow.net/health-animal-ingredients.html

Here is another hidden animal ingredients site if you want it: http://www.happycow.net/health-animal-ingredients.html

There is a possibility that it could be in soap, but im not sure.
You might want to try the organic section of your grocery store, they could/usually/should have animal free things like that, you just have to make sure and it depends on location and such too.

Hope this helps! =)