@gmail.com address belongs to a single Google account.
But it is certainly possible to receive emails that's not being directly addressed to you:
- If the sender has entered your address in the
- If the message is being sent to an email group/list, where your address is listed
- If the sender's email client provides an auto-complete address book, and the sender has mistakenly connected your address with someone else's name
Using the classic Gmail interface (at https://mail.google.com, not the new Google Inbox) you should be able to inspect the message's headers.
Click the message to open it, then click the ▼ next to the Reply button, and then Show original. Going through that garble might give you a hint on why you are receiving the message. See this information from Google.