the full line being "Give us today our epiousion bread"
Today, most scholars reject the translation of epiousion as meaning daily. The word daily only has a weak connection to any proposed etymologies for epiousion. Moreover, all other instances of "daily" in the English New Testament translate hemera (ἡμέρα, "day"), which does not appear in this usage.[1][2] Because there are several other Greek words based on hemera that mean daily, no reason is apparent to use such an obscure word as epiousion.[4] The daily translation also makes the term redundant, with "this day" already making clear the bread is for the current day.[21]
i don't think wikipedia mentions this but it has 'pious' in the middle
Επιούσιος (e-pi-u-si-os) is a composite word (you can make an astronomical number of composite words in Greek if you want to express a new concept, such as tele-phone) and in this sentence it means that which will nourish us for the day. So daily is quite fitting here.