The origins of "Happy Birthday to You" date back to the mid-19th century, when two sisters, Patty and Mildred J. Hill, introduced the song "Good Morning to All" to Patty's kindergarten class in Kentucky. The Hill Sisters' students enjoyed their teachers' version of "Good Morning to All" so much that they began spontaneously singing it at birthday parties, changing the lyrics to "Happy Birthday".
The first book including the combination that bears a date of publication is “The Beginners’ Book of Songs,” published by the Cable Company, a piano manufacturer, in 1912.Children's Praise and Worship, edited by Andrew Byers, Bessie L. Byrum and Anna E. Koglin, published the song in 1918. In 1924, Robert Coleman included "Good Morning to All" in a songbook with the birthday lyrics as a second verse. Coleman also published "Happy Birthday" in The American Hymnal in 1933.
If you're referring to the common song, nobody. (Unless it was recorded by some singer on their album, which you do not have the right to claim as your own), but if you want to record your own version of "happy birthday", then you certainly have my permission for what it is worth.