There are some names that are similar to Nathaniel that *are* found in the Bible:
* Nathanael: This name is used in the New Testament, most notably for the apostle Nathanael (also known as Bartholomew).
* Nathan: This name is found in both the Old and New Testaments.
So, while there is no "correct" spelling of Nathaniel in the Bible, the name Nathanael is a biblical name that is very similar.