Moo is a unisex given name of uncertain origin, but popularly believed to be derived from the onomatopoeic word for the sound made by cattle. It is often associated with simplicity and rusticity, possibly due to its association with rural farming life. In some cultures, it may also have spiritual or symbolic significance related to nurturing and sustenance. Moo is not a common name in many parts of the world, but it has been used occasionally throughout history and has seen limited popularity in recent years.
The name Moo has seen a fluctuation in popularity over the years, with peaks of six births in 2008, 2012, and 2021, and troughs of five births in 2011 and 2023. The years 2013, 2015, and 2017 each saw seven births, indicating a brief period of increased preference for the name during those years. Overall, there have been a total of forty-nine babies named Moo since 2008.