Checking my New Revised Standard Version, it has the last sentence in verse 14, Chapter 5 of Tobit as:
For I knew
Hananiah and
Nathan.
There is a footnote on "
Nathan", and the footnote reads:
"Other ancient authorities read Jathan or Nathamiah."
So this is a place where translators get to take their choice, and there must be some translations that use Jathan instead of
Nathan in that verse.