In my first proper job, we had three Michaels in a department of six. Fortunately they went by the shortened names of "Big Mike" (the boss), Mike, and Mick.
Then in another job, we had four Anthonys in a company of about 60. So we had two Tonys, an Anthony (me), and a Stiffy (his surname was Stiff).
And my boss there was Brian Smith. Apparently, when he was in short trousers, there were four Brian Smiths in his class (of about 30 kids).