faith แปลว่า

From Middle English faith (also fay), borrowed from Old French fei, feid, from Latin fidem. Doublet of foy. Displaced native Old English ġelēafa, which was also a word for belief. * Old French had [θ] as a final devoiced allophone of /ð/ from lenited Latin /d/; this eventually fell silent in the 12th century. The -th of the Middle English forms is most straightforwardly accounted for as a direct borrowing of a French [θ]. However, it has also been seen as arising from alteration of a French form with -d under influence of English abstract nouns in the suffix -th (e.g., truth, ruth, health, etc.), or as a recharacterization of a French form like fay, fey, fei with the same suffix. Compare Champenois fiate, fiaite, showing the same preservation of the final consonant.