I have discovered I actually don’t need to call them at all. They seem to be able to hear the sound of me opening the drawer where I keep the cat food from a mile away! I tried training them with a whistle after I lost Gobbolino who went after a rabbit and never came home. But I wasn’t disciplined enough. Poor Gobbolino, I loved him dearly but he was a free spirit and was never intended to be a pet. So he likely died as he wished to live - out in the woods.My cats have dull names because I refuse to stand in the middle of our road screaming *Whisky! Whisky!* or worse.Mind you both cats generally come to a whistle, like a dog, because Kirby in particular has a very big territory & a whistle carries further.