I came across this Ruby question by someone with a username of Amit, and I can't immediately tell if it's another account of Amit Singh Tomar (another Rubyist), or a completely different person. (Some people in the Ruby tag had a tendency to create new accounts every so often, probably because of technical difficulties)
When I looked at the list of users with the name "Amit", the exact matches filled more than one page.
Should people be told when choosing a username if there's lots of people with that username?
Update: Looking at other names: there's also 11 "John Smith"s (but no "Jane Smith"s), 4 "Aryan"s (probably the kind who'd be allowed to get a cake from Shoprite), and 6 "Ruby"s (the top-repping one is a .net developer). Thankfully, there's only one Jon Skeet right now.