June: [13] June is the month of Juno, the Roman goddess of women and marriage, and wife and sister of Jupiter. Its Latin name was Jūnius mēnsis, ‘Juno’s month’, and Jūnius passed into English via Old French juin. [June etymology, June origin, 英语词源]
c. 1100, from Latin Iunius (mensis), probably a variant of Iunonius, "sacred to Juno" (see Juno). Replaced Old English liðe se ærra "earlier mildness."