c. 1600, "solitary, lone; unfrequented," from lone + -ly (1). Meaning "dejected for want of company" is from 1811. Lonely heart (n.) "a lonely-hearted person" is from 1922. Lonely hearted (adj.) is attested from 1820.
late 14c., "having no companion, solitary, apart from any other," shortening of alone (q.v.) by weakening of stress or else by misdivision of what is properly all one. Used attributively, while the full form is used in the predicate. Compare live (adj.), from alive; colloquial 'long for along. The Lone Star in reference to Texas is first recorded 1843, from its flag when it was a nation. Lone wolf in the figurative sense is 1901, American English.
suffix forming adjectives from nouns and meaning "having qualities of, of the form or nature of" (manly, lordly), "appropriate to, fitting, suited to" (bodily, earthly, daily); irregularly descended from Old English -lic, from Proto-Germanic *-liko- (Old Frisian -lik, Dutch -lijk, Old High German -lih, German -lich, Old Norse -ligr), related to *likom- "appearance, form" (Old English lich "corpse, body;" see lich, which is a cognate; see also like (adj.), with which it is identical).