Middle English word longere comes from Proto-Germanic *langaz (Long.)

Detailed word origin of longere

Dictionary entry	Language	Definition
*langaz	Proto-Germanic (gem-pro)	Long.
lengra	Old English (ang)
*langijaną	Proto-Germanic (gem-pro)	To lengthen, make long.
lengan	Old English (ang)
lengja	Old Norse (non)
lengere	Middle English (enm)

Words with the same origin as longere