The spelling Jansen is used on her birth and marriage records. Janson is shown on her son Louis' marriage record.
"Hawaii, Marriages, 1826-1954," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FWZ1-ZP9 : accessed 2 September 2017), Louis W. Jongeneal and Helen Gneve Mclean, 25 Feb 1919; citing Honolulu, Honolulu, Hawaii, United States, Hawaii State Department of Health, Honolulu; FHL microfilm 1,711,738.
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