"And Aij'alon, place of deer. (1.) A town and valley originally" "assigned to the tribe of Dan, from which, however, they could" not drive the Amorites (Judg. 1:35). It was one of the Levitical cities given to the Kohathites (1 Chr. 6:69). It was not far from Beth-shemesh (2 Chr. 28:18). It was the boundary between "the kingdoms of Judah and Israel, and is frequently mentioned in" Jewish history (2 Chr. 11:10; 1 Sam. 14:31; 1 Chr. 8:13). With "reference to the valley named after the town, Joshua uttered the" "celebrated command, "Sun, stand thou still on Gibeon; and thou," "Moon, in the valley of Ajalon" (Josh. 10:12). It has been" "identified as the modern Yalo, at the foot of the Beth-horon" pass (q.v.). In the Tell Amarna letters Adoni-zedek (q.v.) "speaks of the destruction of the "city of Ajalon" by the" "invaders, and describes himself as "afflicted, greatly" "afflicted" by the calamities that had come on the land, urging" the king of Egypt to hasten to his help. "(2.) A city in the tribe of Zebulun (Judg. 12:12), the modern "Jalun, three miles north of Cabul."

See where Ajalon occurs in the Bible...

Definition of Ajalon:
"a chain; strength; a stag"