good name, but could be challenging for an end-user, as one would have a preconceived notion that the site is related to it's dictionary meaning.
therefore, costs tend to be higher to rebrand a word like this, particularly if the company isn't in the twin, double or some "two of a kind" related biz.
kinda like "kayak.com", but the site is a search engine.
Good Luck!
imo...