is it an endangered species?
Yes
Killer whale
In 2008, the IUCN (International Union for Conservation of Nature) changed its assessment of the killer whale's conservation status from conservation dependent to data deficient, recognizing that one or more killer whale types may actually be separate, endangered species. Depletion of prey species, pollution, large-scale oil spills, and habitat disturbance caused by noise and conflicts with boats are the most significant worldwide threats. In January 2020, the first killer whale in England and Wales since 2001 was found dead with a large fragment of plastic in its stomach.

where does the name killer whale come from UNANSWERABLE how long can these whales live? Wild females average 50 to 80 years and wild males  around 29 years on average, with a maximum of about 60 years does it have other names? Yes, "orca" how intelligent are they? Measuring "intelligence" is difficult in them because environment and behavioural strategies are very different from those of humans do they have any specific calling sound? They produce three categories of sounds: clicks, whistles, and pulsed calls
wiki:7761189
Killer whale [SEP] Conservation
European harbour seals have problems in reproductive and immune functions associated with high levels of PCBs and related contaminants, and a survey off the Washington coast found PCB levels in killer whales were higher than levels that had caused health problems in harbour seals. Blubber samples in the Norwegian Arctic show higher levels of PCBs, pesticides and brominated flame-retardants than in polar bears. When food is scarce, killer whales metabolize blubber for energy, which increases pollutant concentrations in their blood. In the Pacific Northwest, wild salmon stocks, a main resident food source, have declined dramatically in recent years. In the Puget Sound region only 75 whales remain with few births over the last few years.