how to change my name on my account. not the user name but my surname as got married

[**peaseblossom**]

My eBay > Account tab (near top left) > Addresses > Registration address & Primary postage address > Change. On the next page you should be able to write your new name over your old one. Then click on Update at the bottom.

And for Paypal:

https://www.paypal.com/uk/wf/f=ap_namechg