The reason why I believe W. Kaleiheana is William Kaleiheana is because he can be found on the Kalaupapa Patient Register put up by the National Park Service.
Here is what the top of the page for the site looks like. Click on the image to be taken to https://www.nps.gov/kala/learn/historyculture/patient-register.htm
Below is the information found on William Kaleiheana:
It is important to know however, many patients cannot be found in that list.