en_tn/isa/19/18.md

there will be five cities in the land of Egypt that speak

This refers to the people. AT: "all the people in 5 cities in the land of Egypt will speak"

swear allegiance

"promise to be loyal"

Yahweh of Hosts

See how you translated this in Isaiah 1:9.

One of these cities will be called

"People will call one of these cities" (See: rc://en/ta/man/translate/figs-activepassive)

The City of the Sun

The meaning of this phrase is unclear. AT: "The City of Destruction" or "The City that destroys" or "The City of Righteousness"