<p>One reason <a href="https://stats.stackexchange.com/questions/tagged/students-t" class="post-tag" title="show questions tagged &#39;students-t&#39;" rel="tag">students-t</a> can potentially keep reappearing is that it starts with "Student". We don't have any other tags starting with this word.</p>

<p>So instead of blacklisting this tag, I suggest to create <a href="https://stats.stackexchange.com/questions/tagged/students-t-test" class="post-tag" title="show questions tagged &#39;students-t-test&#39;" rel="tag">students-t-test</a> as a synonym of <a href="https://stats.stackexchange.com/questions/tagged/t-test" class="post-tag" title="show questions tagged &#39;t-test&#39;" rel="tag">t-test</a> and <a href="https://stats.stackexchange.com/questions/tagged/students-t-distribution" class="post-tag" title="show questions tagged &#39;students-t-distribution&#39;" rel="tag">students-t-distribution</a> as a synonym of <a href="https://stats.stackexchange.com/questions/tagged/t-distribution" class="post-tag" title="show questions tagged &#39;t-distribution&#39;" rel="tag">t-distribution</a>. Then whoever starts typing "student..." in the tag field will get these two suggestions and will be likely to use one of them.</p>
