Flagg, in the High Peak Hundred of Derbyshire, is a simplex place-name perhaps from the dative plural form (-um) of Old Norse flag ‘a turf, a sod’ with the meaning ‘place where the turfs were cut’.
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Image © Andrew Hill, via Geograph, CC BY-SA 2.0
Image © Neil Theasby, via Geograph, CC BY-SA 2.0
Images © Neil Theasby, via Geograph, CC BY-SA 2.0
Kenneth Cameron, The Place-Names of Derbyshire I. English Place-Name Society Volume XXVII (1959), p. 100.