endlang [ON]
andlang [OE]
along [MI]
alòŋ
https://www.etymonline.com/word/along#etymonline_v_10911
https://www.etymonline.com/word/long#etymonline_v_12412
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED1244
https://bosworthtoller.com/1718