AFAIK, his partner's name is John Lewis.

That being said, marriage licenses are private for obvious reasons and apply to that partnership as outlined in https://health.hawaii.gov/vitalrecords/about-civil-unions/

Relevant:

> The Department of Health can provide certified copies of legal records to verify civil union status in Hawaii to those who are entitled to receive copies pursuant to state law

I got a chuckle from reading that the Domestic Union in Hawaii was signed by Governor Abercrombie, admittedly.