There are two online dating sites named after Cupid: OKCupid.com and Cupid.com.
In London's famous Piccadilly Circus, there's a statue of winged archer that some call the Angel of Christian Charity. However, it's more popularly known as a statue of Eros (source).
Eros has an asteroid named after him: 433 Eros (source).
Cupid is the name of a moon orbiting Uranus (source).
Though he isn't the most famous reindeer of all, one of Santa's reindeer is named Cupid. You probably know this from the song about Rudolph.