What holiday is "Miss All Sunday" named after? In Baroque works, the strongest 14 male members (including the unluckies) are named after numbers:  Mr. 13, Mr. 12, Mr. 11 ... Mr. 0.

The female counterparts for Mr. 13 through Mr. 8 are named: Miss Friday, Miss Saturday, Miss Thursday, Miss Tuesday, Miss Wednesday, and Miss Monday.

From then on, they are named after holidays: Miss Fathers Day, Miss Mothers Day, Miss Valentine, Miss Merry Christmas, Miss Golden Week, Bon Kurei/Bon Clay (don't ask), and Miss Double Finger (New Years Day).

The final female, however, is Miss All-Sunday who is Nico Robin. What is "All-Sunday" referring to?  Is it a holiday?  If it is just meant to be Sunday, why is the "All" there?
It's not a holiday. In his answer in Vol#18 SBS, Oda-sensei clearly said that "All Sunday" means "All the Sundays". In some English translations, translators add "of the year" but this isn't mentioned in the original Japanese text.

(My translation of said SBS)

Reader:
Hello! Odatchi! I noticed something amazing! It's about Mr. 2
Bon Kurei. It's why only Mr. 2 Bon Kurei has this codename! Numbers
are for males, but Bon Kurei is for a female which means "the end of
Bon" because he is an okama, right?

Oda:
Yes, that's right. Female agents' names are in order of the happiest events, so first:
No. 0 is All Sunday (All the Sundays)
No. 1 is Double Finger (New Year's Day)
No. 2 is Mr. 2 Bon Kurei (End of Bon)
No. 3 is Golden Week (Golden Week)
No. 4 if Christmas (Christmas)

.....something like that. Everyone seems to be puzzled with Double Finger.


Note: There is an illustration of both index fingers raised showing 1 and 1 (1/1 or January 1).

Only the author, Oda-sensei knows what "All Sunday" means, but many Japanese-speaking fans think that it means "everyday is Sunday", while a few others think "all Sundays of the year".