Actually you can find this solution easily in Google. However, I’ll put it in my blog just because I am lazy to find it again.
So wordpress has default email address and name which are “Wordpress” as the name, email@example.com as the email. To change it you can use plugin or put these wordpress action to your functions.php file in themes folder :
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Just change the email address and name to your’s. Hope it works, cheers.