Ai (from margin), city, court (from margin), town

Boyd’s Bible Dictionary:

(serpent city). Unknown person or place (1 Chron. 4:12).

Strong’s Dictionary of Hebrew Words:

Transliteration:
`iyr
Phonic:
eer
Meaning:
or (in the plural) par {awr}; or ayar (Judges 10:4) {aw-yar'}; from 5782 a city (a place guarded by waking or a watch) in the widest sense (even of a mere encampment or post)
KJV Usage:
Ai (from margin), city, court (from margin), town

Jackson’s Dictionary of Scripture Proper Names:

the heap (of ruins)