Does customer information include name and email?

I recently started to receive spam to my email address registered with Amazon.com which uses my name, middle initial and last name. Amazon is the only company or person which has that email address and my name with middle initial.

Either Amazon had a data breach or maybe an Amazon marketplace seller sold my name and email.

Do Amazon marketplace sellers have access both the name (as registered on Amazon) and email of customers who purchase from them? Most purchases I have made on Amazon from marketplace sellers have been fulfilled by Amazon but a few were direct ship. Does that make a difference?

I have a hard time believing someone cross referenced my name, address and email to link that email with my name including middle initial just to sell to spammers. Selling mailing lists however is easy and common.