From Merriam-Webster's:
; Main Entry: : shil·le·lagh ; Variant(s): : also shil·la·lah \shə-ˈlā-lē\ ; Function: : noun ; Etymology: : Shillelagh, town in Ireland Date: : 1772 : cudgel
from dictionary.com
shil·le·lagh Audio Help /ʃəˈleɪli, -lə/ Pronunciation Key - Show Spelled Pronunciation[shuh-ley-lee, -luh] Pronunciation Key - Show IPA Pronunciation -noun (esp. in Ireland) a cudgel, traditionally of blackthorn or oak.