So

Concise Bible Dictionary:

King of Egypt. See EGYPT.

Strong’s Dictionary of Hebrew Words:

Transliteration:
Cow’
Phonic:
so
Meaning:
of foreign derivation; So, an Egyptian king
KJV Usage:
So

Jackson’s Dictionary of Scripture Proper Names:

concealed: conspicuous

Potts’ Bible Proper Names:

Lifted up:―a king of Egypt, 2 Kings 17:4. {Elatus}