Greetings,
In case you or your readers are unaware, Otto's name was also spelled Otho as follows:
Herman Otho Esser, son of Jacob J. Esser and Margaret Trapp
married
Alice Maud Hill, daughter of Henry Hill and Helen Dowlan
Parish: St. Francois d'Assise
Location: Ottawa, Ottawa-Carleton, Ontario, Canada
Date: May 17th, 1911
Source: Centre de genealogie francophone d'Amerique
Evelyn in Montreal