Don't know about "Johnson" but they like the name Kevin. I think these are right (let me know if I have them wrong)
1. Jack's ex-wife married a Kevin.
2. Kate's ex was called Kevin.
also:
3. Apparently a basketballer in America is Kevin Johnson.
4. There is a movie called "The Disappearance of Kevin Johnson".
Have no idea if any of this is relevant, none of it seems linked to Michael. Tell us, please!