'Yankee' likely originates from Dutch, specifically the diminutive name 'Janke' (a form of 'Jan'), where 'Jan' meant 'John' and the diminutive implied 'little John'; 'Yankees-style' is a compound formed by joining 'Yankee(s)' + 'style' to mean the style associated with Yankees.

'Yankee' changed from Dutch 'Janke' → Anglicized to 'Yankee' in early American English referring to Dutch settlers and later New Englanders; 'Yankee' then broadened in use and combined with English 'style' to produce compounds like 'Yankee-style' and 'Yankees-style' in modern usage.

Initially, 'Yankee' referred specifically to certain Dutch settlers or New Englanders; over time it expanded to mean northerners or Americans more generally, and compounds like 'Yankees-style' came to denote traits, fashions, or approaches associated with those groups or with the New York Yankees team.