I have a 6 yo old Riley and live in Surrey. I am fairly average but the other 2 Rileys I know are from middle/upper class families so I think the council estate comment is way off the mark. Not to mention rude and judgemental.
If you like the name go for it. Some people love it, other people think it only belongs on council estates or on Labradors but your child, your choice. Not everyone is going to like any name you choose.