Sheshach

Boyd’s Bible Dictionary:

(from the goddess Shach). Symbolical name for Babylon (Jer. 25:26).

Concise Bible Dictionary:

Mystical name applied to Babylon (Jer. 25:26; Jer. 51:41; compare Jer. 51:1). The meaning of the word is not known. According to Jerome the name Babylon, from Babel, was made up of the letters B B L (the 2nd and the 12Th letters of the Hebrew alphabet) these were changed into SH SH CH (the 2nd and the 12Th letters reckoning from the end of the same alphabet), a mode well known to later Jews. It has been supposed that the Jews made this alteration in the name in order that they might speak of the judgments coming upon Babylon without giving offense to those who had carried them away captive.

Strong’s Dictionary of Hebrew Words:

Transliteration:
Sheshak
Phonic:
shay-shak’
Meaning:
of foreign derivation; Sheshak, a symbol. name of Babylon
KJV Usage:
Sheshach

Jackson’s Dictionary of Scripture Proper Names:

thy fine linen

Potts’ Bible Proper Names:

Secure habitation; bag of linen:―symbolical name for Babylon, Jer. 25:26. {Habitatio secura}