Why some female names don't end in t?

(this question was asked in one of the comments)

Why female names like Isis, Hathor, Nephthys, and Qetesh don't end in t as other female words do? Every female name in ancient Egyptian is ending in t. Just that some of them we now know by their Greek version.

- Isis was called by ancient Egyptians most probably Aset (could have been pronounced Iset, Ast. Eset, Auset...)
- Het-Hert (-house of Horus-) is the Egyptian name for Hathor (Greeks called her Hathor).
- The Egyptian name of Nephtys is Nebt-Het (-mistress of the house-) - Nephtys is a Greek version too.
- Qetesh was originally a Syrian deity, so this is a foreign name/word