Genesis 14:6

and the Choraee (dwellers in caverns) who were in the high mountains of Gebala, unto the valley of Pharan, which was nigh upon the edge of the desert.

‘EIL PARAN.’ It is translated in the Targum as “Plain of Paran.” But I say that the word eil does not signify a plain. Rather, the lowland of Paran was called Eil, that of Mamre was named Eilonei, that of the Jordan was called Kikar, and that of Shittim was Abel. All these are translated in the Targum as meishra (plain), but each really had its own particular name. Thus the language of Rashi.
But if it were so, and Kikar are the proper names of these places. Onkelos would have mentioned them in his Targum by their name — i.e., “Eila of Paran,” “Eilonei of Mamre,” — as is his custom with names. Besides, who told him whether these many places were all plains or high mountains [if Eil, Eilonei and Kikar were but proper names of these places]? Again, Mamre is the name of a person — as it is written, brother of Eshcol, and brother of Aner, and they were confederate with Abram — and that place was his, just as it says, ‘Eilonei’ Mamre the Amorite, Ramban’s intent is to argue that since Mamre is the name of an individual, the word Eilonei could not be a proper name since two names cannot be in the constructive state. as I have explained. Rather, Eil paran means a place of terebinths, as it is said, For they shall be ashamed ‘me’eilim’ (of the terebinths) which ye have desired; eilonei is a place of oaks, as it is said, As a terebinth, ‘veka’alon’ (and as an oak), 6:13. Of the ‘alonim’ (oaks) of Bashan. It was customary among them that these terebinths and oaks be planted in the plains before the cities which serve them as “an open land.” And so did Onkelos translate alon bachuth as “the plain of Bechuta.” There the word alon is surely not a proper noun of the location but only the name of the species of tree planted there, as is made explicit [in the same verse: and she was buried] …under the ‘alon.’ Onkelos’ intent, however, is to convey the sense of the expression and not to merely translate the words.
Now the Targum Yerushalmi says with respect to both eil Paran and eilonei Mamre that they mean the plain of Paran and Mamre as Onkelos said, but in the case of alon bachuth, he [Targum Yerushalmi] says it is the nut-tree of Bachut for he considers alon bachuth to be the name of a tree and not a place. Onkelos, however, thought that alon …