Kigenji IGUCHI was born in 1870 as the first son of Kijyu (father) and Kon (mother) in Todorokimachi Village, Azumi County, Nagano Prefecture (later Hotakamachi, Higashihotaka Village, Minamiaizu County).
井口喜源治は、明治3年長野県安曇郡等々力町村（のちの南安曇郡東穂高村、穂高町）に、父喜十、母こんの長男として生まれた。