As to the origin of the name "Juraku," there is a description of 'the place for gathering (ju) songs and dances (raku) for longevity' in "Jurakudai Gyoko-ki" (The Diary of Visit to Jurakudai) written by Hideyoshi's aide, Yuko OMURA, one of "Tensho-ki" (The Diary of Tensho).
「聚楽」という名の由来については、秀吉が御伽衆の大村由己に書かせた『天正記』のひとつ『聚楽第行幸記』に「長生不老の樂（うたまい）を聚（あつ）むるものなり」とある。