do they have any specific calling sound?
They produce three categories of sounds: clicks, whistles, and pulsed calls
Killer whale
Like all cetaceans, killer whales depend heavily on underwater sound for orientation, feeding, and communication. They produce three categories of sounds: clicks, whistles, and pulsed calls. Clicks are believed to be used primarily for navigation and discriminating prey and other objects in the surrounding environment, but are also commonly heard during social interactions.
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
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Killer whale [SEP] Vocalizations
Like all cetaceans, killer whales depend heavily on underwater sound for orientation, feeding, and communication. They produce three categories of sounds: clicks, whistles, and pulsed calls. Clicks are believed to be used primarily for navigation and discriminating prey and other objects in the surrounding environment, but are also commonly heard during social interactions. Northeast Pacific resident groups tend to be much more vocal than transient groups in the same waters. Residents feed primarily on Chinook and chum, which are insensitive to killer whale calls (inferred from the audiogram of Atlantic salmon). In contrast, the marine mammal prey of transients hear whale calls well.