<p>Currently there are approximately 13 mentioning <a href="https://stats.stackexchange.com/search?q=birthday+paradox+is%3Aquestion">birthday paradox</a> and another 22 mentioning <a href="https://stats.stackexchange.com/search?q=birthday%20problem%20is%3Aquestion">birthday problem</a> (I guess there could be more). In most cases it is the main topic of the questions. Should we have separate tag for it? It is pretty important topic in probability so it may be worth having a tag.</p>
