Apparently the passive participle of the same as ya'ar; wooded; Jaur, an Israelite -- Jair(from the margin).
see HEBREW ya'ar
H3265. Yaor
יָעוֺר Kt, יָעִיר Qr, proper name, masculine father of Elhanan the giant-slayer 1 Chronicles 20:5 (Ιαειρ) + "" 2 Samuel 21:19 (where read יעיר for יַעֲרֵי, and strike out אֹרְגִים, see Th We Dr Bu Kit HPS).