Crittenden Crettenden Cruttenden

Looking for information on the Crittenden family who originated in Medway, Kent, in particular Chatham, Luton, Rochester and Higham. One branch emigrated to Australia and changed their name to Crettenden. Am already in touch with one Australian relative but would love to hear from more! Also been told that the name had changed to Cruttenden in Australia, so they will also be related somehow. Have lots of info. on them but would love more.