Encyclopaedia Britannica, 11th Edition, "G" to "Gaskell, Elizabeth" / Volume 11, Slice 4

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In the earliest form the difference from C is very slight, the lower lip of the crescent merely rising up in a straight line
, but
and
are found also in republican times. In the earliest Roman inscription which was found in the Forum in 1899 the form is
written from right to left, but the hollow at the bottom lip of the crescent is an accidental pit in the stone and not a diacritical mark. The unvoiced sound in this inscription is represented by K. The use of the new form was not firmly established till after the middle of the 3rd century B.C.
In the Latin alphabet the sound was always the voiced stop (as in gig ) in classical times. Later, before e , g passed into a sound like the English y , so that words begin indifferently with g or j ; hence from the Lat. generum (accusative) and Ianuarium we have in Ital. genero and Gennajo , Fr. gendre and janvier . In the ancient Umbrian dialect g had made this change between vowels before the Christian era, the inhabitant of Iguvium (the modern Gubbio) being in the later form of his native speech Iuvins , Lat. Iguvinus . In most cases in Mid. Eng. also g passed into a y sound; hence the old prefix ge of the past participle appears only as y in yclept and the like. But ng and gg took a different course, the g becoming an affricate d ẓ ( dzh ), as in singe , ridge , sedge , which in English before 1500 were senge , rigge , segge , and in Scotch are still pronounced sing , rig , seg . The affricate in words like gaol is of French origin ( geôle ), from a Late Lat. gabiola , out of caveola , a diminutive of the Lat. cavea .
The composite origin of English makes it impossible to lay down rules for the pronunciation of English g ; thus there are in the language five words Gill , three of which have the g hard, while two have it soft: viz. (1) gill of a fish, (2) gill , a ravine, both of which are Norse, and (3) 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 .