mid-15c., "for nothing, freely," from Latin gratis, contraction of gratiis "for thanks," hence, "without recompense, for nothing," ablative of gratiae "thanks," plural of gratia "favor" (from suffixed form of PIE root *gwere- (2) "to favor"). Meaning "free of charge" is 1540s.

grape variety used for producing red wine, by 1828, generally said to be from French merle "blackbird," from Latin merola, but the reason for the name being given to the grapes is obscure; perhaps from a supposed fondness of the birds for the grapes, or from the dark color of the wine made from it. 

late 14c., "roaring, shouting;" 1590s, "wailing, weeping," present-participle adjective from cry (v.). Sense of "demanding attention or remedy" is from c. 1600. U.S. colloquial expression of disgust, impatience, etc., for crying out loud, is by 1921, probably a euphemism for for Christ's sake.

1550s, Doll, an endearing name for a female pet or a mistress, from the familiar form of the fem. proper name Dorothy (q.v.). The -l- for -r- substitution in nicknames is common in English: compare Hal for Harold, Moll for Mary, Sally for Sarah, etc. 

From 1610s in old slang in a general sense of "sweetheart, mistress, paramour;" by 1640s it had degenerated to "slattern." Sense of "a child's toy baby" is by 1700. Transferred back to living beings by 1778 in the sense of "pretty, silly woman." By mid-20c. it had come full circle and was used again in slang as an endearing or patronizing name for a young woman.