Research in Motion, makers of the popular BlackBerry messaging device, has sued Korean electronics giant Samsung over the name of its new BlackJack messaging device. The BlackJack device is sold in the United States by Cingular Wireless, and some say it superficially resembles the new BlackBerry Pearl. Cingular has been marketing the BlackJack aggressively, running a series of television and print commercials touting the device. Unlike previous lawsuits, RIM isn’t claiming patent infringement in regard to the BlackJack. Instead, the company claims that the name of the device is confusingly similar to the BlackBerry. RIM recently introduced the BlackBerry Pearl to go after the same consumer market that the BlackJack is courting.