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to the files on Ancient Ireland in the LexiLine Files
Aughnacliffe in County Longford, Ireland represents Ursa Minor as a hammer-headed type of axe. That AUGH-NA meant "axe" is supported by MacBain's Dictionary where Gaelic EIGH is AXE.
See http://www.ceantar.org/Dicts/MB2/mb16.html where it is written:"eigha file, Irish oighe: *agiâ; root ag of English axe, Gothic aqizi"and where cliffe may be"clipa hook, clip, Irish clipe, a gaff; from the English clip. See cleibe"i.e. "a hooked axe, a crooked axe".
The cliffe in Aughnacliffe is conceivably related to Gaelic calbh meaning "head", so that Aughnacliffe would simply have meant "axe head".