We learned as children in East London. It is a bouncing ball game and everytime one sings O'Leary one leg crosses over ball. It must be an old Irish game East London was full of Irish immigrants at one time. My mother played it as well.

We learned it as;

One, two, three O'Leary
Four, five, six O'Leary
Seven, eight, nine O'Leary
ten O'Leary drop the ball.

When you wanted to pass the ball to the player behind it was

One, two, three O'Leary
My balls down the aerie
Don't forget to give it to Mary
early in the morning.