The CV is most often used in academics and medical professions, and it virtually non-existant in the business world.

The résumé is properly pronounced REZ-oo-MEY. That is, the emphasis is on the first AND the third sylable. (Which is why it has accents there.) Other spellings are often found, but are not correct. Other pronounciations are not correct.

In business, many people ignore the accents in correspondence because they are lazy, or unable to figure our how to make an accent mark. Even though there is a high tolerance for the mispelled "resume" version, and it will probably not make a difference between getting the job or not, it is nevertheless, incorrect. It would be properly pronounced "REZ-oom".

I am not judgmental. Spell it and pronounce it any way you choose. But, if you want to know the correct spelling, that is it.