Your personal data is pretty valuable to companies, especially because many of them mine and sell it. Utilise the middle name field to find out which companies have sold your personal information.
Photo by startupstockphotos.com
If you want to see who's selling your data, one Redditor suggests a clever way to do just that:
When you sign up for anything online, put the website's name as your middle name. That way when you receive spam/advert emails, you will know who sold your info.
This doesn't exactly prevent your info from being sold, but it does tell you which site did the deed so you can warn others and stay away from them in the future. For more detail, head to the link below.