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Wikipedia probably has a better answer, but basically the name Moloch is from the Bible. One of the ways genocide of the inhabitants of Canaan (the promised land) is justified is by describing Canaanites as immoral people who sacrifice their own children to idols. Moloch is supposed to be one of the idols, but the actual history of Moloch is very sparse. Probably was one of the main local gods way back in the day like Baal. Probably not even an "evil" god at all (like Baal) since the Bible is heavily biased against the competing local gods in the region.

So basically, a god of Canaanites we only know about from the people that wanted to wipe them out and wrote very influential texts.