The story
The first documented example of the word "zeigl" occurs in a 1508 document at Neustadt an der Waldnaab, having derived from the German "Zeichen" meaning Sign or Sigil, or "zeigen" meaning Show. It was pronounced "zeigel" in the Oberpfalz region. Today the word "Zoigl" is still in use and has given its name to this style of beer production.
Etymology from Wiktionary, CC BY-SA 4.0.