Except for Mercury and Venus, all the planets in our solar system have moons orbiting them: two around Mars, many around the gas giants, only one around Earth. The existence of a second moon has been postulated and refuted time and time again. In the 1950s, a team led by Pluto discoverer Clyde Tombaugh searched for new moons for four years, without success.
However, there are natural objects that orbit the Earth corpses, so-called quasi-satellites. We currently know of seven; they are quite small cosmic chunks. One of them is this one asteroid 469219 Kamo’oalewa, which was discovered in 2016 with a telescope from Hawaii and therefore has this pleasant Hawaiian name.