Usually, the very first thing a visitor notices about you is your logo. In this modern age where people read from top to bottom, left to right, putting your logo at the top left-hand side of your site is more reasonable to enable visitors spot it and instantly recognize the website owner.
Your logo must not be your name however, if promoting yourself online is your aim then using your name is a good option. Also, make sure your logo is linked to your home page always. This is something that visitors commonly expect online.