Begging

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Middle English: probably from Old English bedecian, of Germanic origin; related to bid2.

wiktionary

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From Middle English begging, beggyng, beggynge, equivalent to beg +‎ -ing(gerund ending).

From Middle English beggin, beggyn, beggyng, (also beggand), present participle of beggen(“to beg”), equivalent to beg +‎ -ing(participle ending).

etymonline

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begging (n.)

"act or habit of asking for alms, mendicancy, a beggar's way of life," late 14c., verbal noun from beg (v.). To go begging "find no one to fill or take" is from 1590s. Related: Beggingly.