From BatReader, Boston resident, and Jeremy Wahlman:

At yesterday's Red Sox game here in Boston (the first at home since the big Dougie trade), he was announced as "Dave Mientkiewicz," before the PA announcer corrected himself, saying "That's Doug--Doug Mientkiewicz."    Apparently quite a few Sox players got a good laugh out of this.  And for his part, Dougie/Davey waved his cap to the fans.