Cornwall: Seen from 1284. From St Ia, a Cornish saint.[1]
Cambridgeshire: Seen from 1110. From Ivo of Ramsey, a Cornish saint whose relics were found here.[1]
Dorset: Seen from 1167. 'Place overgrown with ivy' from Old English*īfet. Saint added more recently in reference to other settlements called St Ives.[1]
New South Wales: Named in 1900, likely from either the Cornish town or after Isaac Ellis Ives, a local politician.[2]