Is there a way to format cells to where – when you type in a certain person’s first name, it will insert something entirely different?

This has seemed to have happened on a computer at work. In Excel, when I type in “Martha” …
then tab, or otherwise leave that cell, Martha changes to “•Cool”

If I type in anyone elses name – it stays that name. But if I type in “Martha”….. it changes to “•Cool” … with the bullet and the word Cool.

I think someone (Martha) is messing with me – lol. They probably know a “secret” format to do this. I am trying to figure it out without having to actually ask Matha.

Hope you can help!