Two brands for Naltrexone include Depade and Revia. Considering that two months ago WHO issued guidelines for preventing overdose by lay people with naloxone it might be a good factoid to recall. Scotland's program reduced both the percentage and total opioid deaths.
Two other names to be aware of are combination products:
Embeda - morphine sulfate/naltrexone
Contrave - naltrexone and bupropion


Sources: Medscape CE on Opioids, Drug Topics articles, and a BMJ editorial. http://www.bmj.com/content/349/bmj.g6580