From the faq (<a href="http:&#x2F;&#x2F;bazel.io&#x2F;faq.html" rel="nofollow">http:&#x2F;&#x2F;bazel.io&#x2F;faq.html</a>):<p>Did you rewrite your internal tool as open-source? Is it a fork?<p>Bazel shares most of its code with the internal tool and its rules are used for millions of builds every day.<p>What&#x27;s up with the word &quot;Blaze&quot; in the codebase?<p>This is an internal name for the tool. Please refer to Bazel as Bazel.