A surname is read as belonging and the line you come from. Hearing it spoken, forgotten or changed in a dream is read as feelings about your roots and your place in the family.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.