<p></p>
<blockquote>
<p dir="auto">I was thinking there was an API method that could be used but there isn't one that does the lookup by name.</p>
</blockquote>
<p dir="auto">There is a single one. In <a href="https://github.com/grischard/org.openstreetmap.username/blob/9d67583bd3e0342a9770cde48f23586f707012ee/username.php#L61">the civicrm username check extension</a> I check <code class="notranslate">https://api.openstreetmap.org/api/0.6/changesets?time=9999-01-01&display_name=TomH</code> or <code class="notranslate">https://api.openstreetmap.org/api/0.6/changesets?time=9999-01-01&display_name=GhostofTomH</code> for 404.</p>

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