Where does Android get these email addresses from? In an app called Wirex an email autofill appeared. This is very confusing to me. The list contains very old emails, emails I had already forgotten 2 years ago.

I bought this phone in 2018. Where does Android grab these email suggestion from? These are all emails I created so no random email from contact lists.
I found where they came from. I traced those emails to my google account. Basically they were stored as login information (chrome autofill)