Otto, a self-driving trucking startup built by ex-Googlers, darted into the spotlight earlier this month when Uber acquired it for a reported $680 million. So did Clearpath Robotics, a Canadian maker of autonomous robots that includes a division of self-driving warehouse robots named—you guessed it—Otto. Clearpath is now suing Uber’s Otto, the full name of which is Ottomotto, for infringing on …