Miksi yhdessä amerikkalaisessa romaanissa halloween on kirjoitettu hallowe'en?

The "all" and "s" were dropped, "hallows' " and "even" became a closed compound, and the apostrophe took the place of the "v," giving us "Hallowe'en"—just one of many transitional spellings along the way to "Halloween," which the Oxford English Dictionary shows as first appearing in 1786

-Googlen antama ensimmäinen vastaus

All hallows eve on myös vaihtoehto

Alunperin All Hallows' Eve eli kaikkien pyhien (pyhimysten) aatto.