Nephthar is the Revised Version form of the name rendered “Naphthar” in the King James Version.
Definition
Nephthar is the Revised Version form of the name printed “Naphthar” in the King James Version.
Biblical Usage
The supplied material gives only the difference between the two version forms.
Historical Background
The variation is a matter of English version spelling.
Historical Bible Dictionaries
International Standard Bible Encyclopedia (ISBE)
<p>naf'-thar (the King James Version): the Revised Version (British and American) "Nephthar."</p>