"The phrase is also used as the first line of one of the extra cod Latin verses added in 1953 to an unofficial school song at Harvard University: Ten Thousand Men of Harvard"

The first verse goes:

Illegitimum non carborundum;

Domine salvum fac.

Illegitimum non carborundum;

Domine salvum fac.

Gaudeamus igitur!

Veritas non sequitur?

Illegitimum non carborundum—ipso facto!

Use as a motto:

The U.S. submarine USS Tunny (SSN-682
.US Army Special Forces 2nd Battalion, 1st Special Forces Group (Airborne), Joint Base Lewis-McChord, Washington
US Air Force 490th Missile Squadron "Farsiders", Malmstrom AFB
Informal motto of The Fletcher School of Law and Diplomacy
Whitehorse Star, newspaper in the capital of the Yukon Territory
The weekly Alaskan newspaper the Nome Nugget

You are in the minority as to its popularity.