from where was the word evening originated ?

Answer 1

The word evening originated from Old english word aefnung and in Indo European it means lateness.

Answer 2

It is of Middle English origin, from Old English ǣfnung, from ǣfnian, to become evening, from ǣfen, evening.

Answer 3

Further to CT's answer, 'æfen' is cognate with 'after' which gives the indication of 'later in the day'.