What does River mean?
An English nature name taken directly from the word 'river' (ultimately from Latin riparia, riparius 'of the riverbank').
What does Oakley mean?
A surname and place name from Old English 'ac' (oak) + 'leah' (woodland clearing or meadow), so literally 'the oak clearing'. It names numerous English villages (in Bedfordshire, Hampshire, Kent and elsewhere) and only became common as a given name recently.