About the origin of the name fukujinzuke, the following theories are held, that because it contains various kinds of vegetables, that because the shop was near the shrine deifying Benzaiten (the Goddess of Eloquence, Music, and Art) at the Shinobazu-no-Ike Pond in Ueno, or that a writer Kinga BAITEI named it because no other subsidiary for rice are needed so long as fukujinzuke is an accompaniment to, then food cost would be saved and it is happy as if the Shichifukujin (Seven Deities of Good Luck) had come to home.
いろいろな野菜が入っていること、また店が上野不忍池の弁才天近くにあったこと、更には「ご飯のお供にこれさえあれば他におかずは要らず、食費が抑えられ金がたまる（＝家に七福神がやってきたかのような幸福感）」という解釈で、作家の梅亭金鵞が名付けたという説もある。