Plural of chatty or informal nickname; multiple eartheware cooking pots, or plural of a person nicknamed 'chatty'.
Either from chatti (plural form) or from chatty (talkative person) + -ies (informal plural/nickname suffix). The spelling varies depending on whether referring to the cooking vessels or people.
Chatties is a great example of how English words can have completely different meanings and origins in different contexts—it could refer to clay pots from India or nickname multiple talkative people!
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