Lego is a Danish toy production company based in Billund that produces plastic toys. The company is famous for its Lego bricks.
The font used for the Lego logo is very similar to LegoThick, which is a free fan made font based on the logo itself. Note that this font is available in capital letters only, so you will have to use it with capitals, or you will see blocks.
You can find the free Lego Font download for personal use at here.