UPDATE: After a further review in March 2017, TLG have confirmed that they would like us to change the site name. This post is kept for reference.
I've got this comment from Jan Beyer, Community Operations Manager for the LEGO Group:
Regarding the website - it should not be called LEGO Answers - this imply that the LEGO Group answers but perhaps "Answers regarding LEGO bricks".
Now I have to admit I can't really find the part of the site which says "LEGO Answers", as everywhere I look I see "LEGO® — Stack Exchange" which may be OK; but if it does exist, can it be changed somehow?
Edit to add:
The site still has
<title>LEGO® - Stack Exchange</title>, and so appears as "LEGO® - Stack Exchange" in Google results, and the mobile site also still has the main page heading as "LEGO®"
LEGO Legal Affairs reviewed LEGO Answers and did not cite any problems with the name. They made a few suggestions about improving the site description to bring it into compliance. So, unless we hear otherwise, the site name does not need to be changed.