His father was KAMO no Tadayuki and an expert of the Yin and Yang philosophy, but he gave up the Way of Yin and Yang as the family's succeeded academic area to study Kidendo (the study of the history), and replaced his family name of 賀茂 with 慶滋.
父は陰陽家・賀茂忠行であるが、家学であった陰陽道を捨てて紀伝道を志し、姓の賀茂を読み替えて慶滋とした。