Is it possible for me to have more than one AdSense account, or would that violate Google's terms of service in some way?
From Google AdSense FAQ: Can I sign up for more than one account?
No. Publishers are not permitted to maintain multiple AdSense accounts under the same payee name.
However, we've provided some guidance below that may help you if you're trying to submit multiple applications. Please identify which common reason best describes your situation, then follow the instructions below.
After going through the original source of the question, OP wanted to ask whether
Can i will have adsense multiple account difference name and address but same surname ?
Two different names and addresses are essentially two different people, and a lot of people share surnames.
I may as well add that two siblings may(?) be allowed to have two adsense accounts for different names but same address. So different names but same addresses may(?) also do.
But if you are impersonating someone else and are creating accounts under different names and address for your own use then it is not permissible.
I recently researched on this topic. Accoding to my understanding, you can have multiple accounts if
1) The addresses are different
2) Each account is a separate company / firm (even if they have same address).
(Thus you can have 1 individual + any number of company accounts at same address).
You cannot have multiple "individual" (non company) accounts at same address even for family members.
Do confirm all of this in google TOS though.