Garnishing a non-account holder

I received a loan check from a company I previously had a loan with at one time. The check had only my name and I was the only one to sign it. Now, due to being laid off, a judgement has been entered and they will begin garnishing my wages. However, they also included my now ex-husband in the judgement and are going to garnish his wages. How can they do this if the loan was in my name only?