Probably for 'ariy'el; a hero (collectively) -- valiant one.
see HEBREW 'ariy'el
H691. erel
[אֶרְאֵל] noun [masculine] (form & meaning dubious see below) — only in אֶרְאֶלָּם Isaiah 33:7; Ges אַרְאֵלִם heroes; compare Thes Kn Che; Hi אֲרִאֵלָם; compare De, who derives from אֲרִיאֵל, literally = lion of God, collective with suffix, & translated their heroes; name, of a people from אֲרִיאֵל = Zion NbrAth. 1886, p. 400 compare Sayib. 466; Ew אַרְאָל = אַרְעָל trembling, compare Di. Brd proposes הילילו 'cry pitifully.' ᵑ9 ᵑ6 and others read some form of ירא ᵐ5 ראה,. Wholly uncertain.
II. ארה (burn, compare Arabic , whence hearth; Ew§ 163 g and others see below)