Etymology of 'refrigerator' vs. 'fridge'

[Larry_Mudd]

Frigidaire was the most popular consumer refrigerator.

According to this site,

In 1915 inventor Alfred Mellowes devised the first self-contained electric refrigerator for the home in Fort Wayne, Indiana. He called it the Guardian Frigerator, and it was the predecessor to the Frigidaire refrigerator brand.