Sunan "Alexander Selkirk" yana nufin wani mutum mai tarihi wanda ɗan ƙasar Scotland ne matuƙin jirgin ruwa kuma ɗan kasada. An fi saninsa da kasancewarsa wahayi ga halin Robinson Crusoe a cikin littafin labari na wannan suna ta Daniel Defoe. Selkirk ya kasance a makale a wani tsibiri mai nisa a Kudancin Pasifik sama da shekaru huɗu, daga 1704 zuwa 1709, kuma ya tsira da hikimarsa da basirarsa. Kalmar "Alexander Selkirk" wani lokaci ana amfani da ita don nufin wani da ba a sani ba ko kuma ya makale, musamman a tsibirin da ba kowa.