Albert Barnes Commentary Nehemiah 13:24

"and their children spake half in the speech of Ashdod, and could not speak in the Jews` language, but according to the language of each people." — Nehemiah 13:24 (ASV)

The speech of Ashdod - The Philistine language, which was akin to that of Egypt.

According to the language of each people - The children spoke a mixed dialect - half-Philistine, half-Hebrew.