are they hunted?
Yes, commercial hunting of killer whales date to the 18th century
Killer whale
commercial hunting of killer whales date to the 18th century in Japan. 
where does the term killer whale come from The genus name "Orcinus" means "of the kingdom of the dead", or "belonging to Orcus". what is this organism? The killer whale or orca is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member. what are their different varieties? There are three to five types of killer whales
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Killer whale [SEP] Whaling
The earlier of known records of commercial hunting of killer whales date to the 18th century in Japan. During the 19th and early 20th centuries, the global whaling industry caught immense numbers of baleen and sperm whales, but largely ignored killer whales because of their limited amounts of recoverable oil, their smaller populations, and the difficulty of taking them. Once the stocks of larger species were depleted, killer whales were targeted by commercial whalers in the mid-20th century. Between 1954 and 1997, Japan took 1,178 killer whales (although the Ministry of the Environment claims that there had been domestic catches of about 1,600 whales between late 1940s to 1960s) and Norway took 987.