that is truly a great story, jo; but I'm afraid there's more to it than that. feck really is the root for feckless and feckful and seems to be a Scottish alteration of ME effect. it means either:
1a) the greater part: majority b) part, portion <the greater ~ of the year>
or
2) value, worth <no ~ would come of it>
or
3) a usu. large number or quantity <a whole ~ of them came>