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There is a block in lib/tpl/dokuwiki/tpl_header.php:

      // display logo and wiki title in a link to the home page
      tpl_link(
          wl(),
          '<img src="'.$logo.'" '.$logoSize[3].' alt="" /> <span>'.$conf['title'].'</span>',
          'accesskey="h" title="[H]"'
      );

Remove <span>'.$conf['title'].'</span> from it.

Each update of Dokuwiki engine will overwrite this change. You'll need to repeat it manually after each update or copy paste doku template into a new one and update this new template manually.

http://stackoverflow.com/questions/41586359/hide-title-in-header-of-my-dokuwiki