Cyprus H Gordon wrote that Abraham probably carried credentials from the Hittite monarch, since he was always ushered in before kings wherever he went. And Abraham was of royal blood.
Gordon's speculation isn't compelling, not least because Abraham was a Semite, and "Hittite" is not a Semitic language, which leaves him right out of the "Hittite" royal family.
Add to that, the big "Hittite" archive had loads of cuneiform tablets, most of which were in two languages (neither one is Semitic), with a smattering of other languages (including some Assyrian, which is a Semitic language) here and there. The names for the languages given *in* the languages are not "Hittite" or "Hattish" (the two working names picked in modern times), and the name "Hittites" was picked from the OT.