ellen:

From Middle English elne, ellen, from Old English ellen ?(“zeal, strength, power, vigor, valor, courage, fortitude, strife, contention”), from Proto-Germanic *aljan? ?(“zeal, power, courage”), from Proto-Indo-European *al- ?(“to burn”). Cognate with Middle High German ellen ?(“strength, manhood”), Middle Low German ellen ?(“strength, power, courage, vigor, bravery”), Icelandic elja ?(“endurance, energy”).