Mystery Squash

I first saw one of these in Sri Lanka, I think I had seen them in Singapore before, and then picked one up at Tekka Market. It's shaped like a large pear with a bumpy rind, kind of has the taste and texture of a cross between a cucumber and a zucchini.  Soaks up flavors around it like a sponge.  Just stir-fried it with garlic, chile padi and oyster sauce, and leeks and shiitake and a green veggie also unnamed, but I don't care. The guy at Tekka only knew the Chinese name for it, the chef in Sri Lanka called it a gourd squash, and then I googled it and came up with chayote, which supposedly originated in Central America. I'm stumped, but it tasted great!