This is one of the biggest Mandela Effects for me. I have made about 5 videos on it on YouTube. If you search my name along with Mandela Effect and Jiffy, they will pop up.
Before I had heard of the Mandela Effect sometime in 2014 or 2015 I purchased some Jif peanut butter and didn't recognize the name. I hadn't bought any peanut butter in years and when I grabbed my old favorite I looked at and thought to myself, oh wow they changed the name. After that I just went on with my life not knowing that it had been Jif my entire life.
The Mandela Effect is an incredible phenomenon.