There's a displace function that I suppose is meant for this (check your markers now and you'll understand). I could pull them farther apart if you wish.

As an alternative solution, I could put both names on the same marker.

FWIW, there are ways to find a marker that got buried below others. Browsing the list on the right is obvious, but not very helpful I suppose. Additionally, when you click a marker and then close the popover that appears, the marker will be moved behind the markers it was in front of.