Why is my mac replacing my name on all my email as "Holiday In The United States"?
The good thing is that you haven't got a virus, or been hacked. The bad thing is this has been a bug (for want of a better word) that seems to appear from time to time and it's been around for way too long!

There is no single catch-all solution that works in all cases, so it's not so easy to provide a quick answer here. However, you may find the following online discussions useful:


My gmail name comes up as Holidays in the United States
Why does my name say Holidays In United States
Mail changes my name to some odd contact or calendar group