Jace Herondale is a character from the Shadowhunters books by Cassandra Clare, and is one of the main characters in her series 'The Mortal Instruments.'
This is a nickname for a character named Jonathan Christopher in the Mortal Instruments book series by Cassandra Claire.
― Anonymous User 9/24/2017
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Jace Wayland is a main character of The Mortal Instruments book series by Cassandra Clare, The books are very popular and are currently being made into films, this is possibly why the names popularity has gone up recently.