Ichiraku name - Ichirakumyo

…In the Kamakura period, it was often used as a kana or Buddhist name, such as the Jyu-raku-mei of Tsuboe Shimogo in Echizen Province, and the Jyu-raku-bo and Jyu-raku-mei of Ategawa-sho in Kii Province. A similar example is the "Ichi-raku-mei," but as it became widely used among the common people, Jyu-raku came to be understood with emphasis on "raku." During the Sengoku period, Kuwana and Matsusaka in Ise, which became places for free trade between merchants from various provinces, were called "Jyu-raku no tsu" and "Jyu-raku no machi," and markets where merchants who were exempt from transportation taxes at checkpoints and ferries gathered, had the right of non-entry, were exempt from land tax, and were also asylums where debts and lord-vassal ties could be severed, were called "rakuichi" and "rakuichiba." In this way, "Jyu-raku" and "raku" came to express, if not fully express, the freedom of the Middle Ages. …

*Some of the terminology explanations that mention "Ichirakumaya" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…鎌倉時代，越前国坪江下郷十楽名，紀伊国阿氐河（あてがわ）荘十楽房，十楽名のように，しばしば仮名（けみよう）･法名として使われた。同様の例として〈一楽名〉も見られるが，このように広く庶民の間で用いられるにつれて，十楽は楽に力点を置いて理解されるようになる。戦国時代，諸国の商人の自由な取引の場となった伊勢の桑名，松坂を〈十楽の津〉〈十楽〉の町といい，関，渡しにおける交通税を免除された商人の集まる市（いち）で，不入権を持ち，地子を免除され，債務や主従の縁の切れるアジールでもあった市を〈楽市〉〈楽市場〉といったように，〈十楽〉〈楽〉は中世における自由を，十分ではないにせよ表現する語となった。…

※「一楽名」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報