It's actually called holy Friday (Vendredi Saint) in France.

English-speaking eastern christians call it this too. But every day of holy week is named like that, holy tuesday, holy saturday, etc. Easter/Pascha is the one exception in the week.

At risk of being a pedant, Pascha would not be the exception to Holy Week but rather after the conclusion of Holy Week. The end of week is sundown on Saturday.

After Holy Week has ended on Saturday, The Resurrection (i.e. Pascha), occurs on the first day of the week - Sunday. :)

(you are right it is slightly tedious those details, but well done) Overall it seems striking to me that the seven day week itself is one of the enduring and fundamental features of the ancient world that has so thoroughly formed the fabric of modern life in the West and elsewhere.

Oh yeah true. Then... palm sunday is the exception?

No, it's the first day of the holy week

Liturgically, the day begins at sundown and both the Holy Week and Paschal services are moved to the beginning of the Liturgical day “in anticipation”. So the Lamentation service of Holy Saturday will have been said on the calendar-Friday and the first services of Pascha, the Rush Procession and Orthros (Matins), will start on calendar-Saturday. So, Pascha begins on Saturday, but also on Sunday depending on your reference point.

There are places like Mt. Athos, West Bank monasteries they actually keep time like that https://en.m.wikipedia.org/wiki/Byzantine_time

So sundown is 00:00 and so on.

In Dutch those have all their own somewhat cryptic names: Goede Vrijdag (Good Friday), Witte Donderdag (White Thurday), Stille Zaterdag (Silent Saturday).

In Brazil too. Sexta feira Santa

Also in Spanish, "viernes santo" ("holy Friday")