Half-Satyr
The Satyr is a mythological being famous for being a race of horny drunken bastards. Naturally, it follows that such a race would be quite indiscriminate about boning anything that'll stand still long enough, which ultimately leads to the creation of Half-Satyrs. At least, this was the logic of Dungeons & Dragons, and as such half-satyrs have popped up in a few places.
They are a definitely niche idea; aside from appearing for Advanced Dungeons & Dragons 1e in Dragon Magazine #109, their other appearances were all in third-party sources for 3rd edition; Dangerous Denizens for Kingdoms of Kalamar, and Dragon Magazine #313. The Green Ronin sourcebook Bastards & Bloodlines also contains the Piper, which are half-satyrs born to elven or halfling mothers.
One distinctive oddity of the D&D half-satyr is that, for some reason, they almost always portrayed as an all-male species. Which makes absolutely no sense when you think about it for a moment: after all, if satyrs themselves are an all-male race that reproduces by bonking the women of other races, then logic would dictate that sons would be pureblood satyrs and that it'd be the daughters who are only half-satyr.
But, D&D and reproductive logic can be kind of screwed up - witness the Sphinx - and so it continues. Though at least the Tellene Half-Satyr is noted to have female half-satyrs exist (they're just rare) and the Piper is equally likely to be male or female.