Name of this two pronged female DC power supply plug (looks like a pair of rectangular glasses)
I found a few listings for this plug that refer to this plug as a "Waeco Fridge Adapter".  It looks like the plug is used for 12vdc fridge and other thermoelectric cooling devices.  I'm not going to post a link because most of them are eBay listings that will expire soon, but that name should help you a lot.



I found this link on Amazon that might last a little longer, but it doesn't give a technical name for it either.

Looks like a good generic search term is "polarized 2 pin 12V DC plug for electric cooler boxes".