Peter Giles, 1911 Encyclopædia Britannica (1911)
“ Gill, the surname, which is mostly Gaelic = White; and (4) gill a liquid measure, from O. Fr. gelle, Late Lat. gella in the same sense, and (5) Gill, a girl’s name, shortened from Gillian, Juliana (see Skeat’s Etymological Dictionary) . No one of these words is of native origin; otherwise the initial g would have changed to y, as in Eng. yell from the O. Eng. gellan, giellan. (P. Gi.) ”
