I haven’t played GW2 in over a year but randomly this month I have been getting numerous login attempts sent to my email. I still have my account though, so I’m not hacked yet at least.
All attempts have been made on July 21, 2013.
Address: 113.117.126.79
City: Rongcheng
Region: 30
Country: CN
Address: 125.112.63.37
City: Pujiang
Region: 02
Country: CN
Address: 74.221.210.119
City: Chandler
Region: AZ
Country: US
I think AP’s advice is very sound. If you think the account was accessed, contact Support. If you don’t believe it was accessed, but that access was only attempted then change your password (something complex, something unique) and see if these attempts stop.
And if you use that email and password combination at other sites, change your password at those other sites as well.
Yes, that’s what “unique” means. 
Then it would no longer be unique. Please let’s not get into an off-topic discussion. My first comment was clear enough.
