Seeing a wallet in your dream typically indicates marriage or the birth of a child. It also serves as a symbol of money, reflecting your financial situation. If your wallet falls into water, it may signal the loss of something valuable in your life. However, if you find the wallet, it suggests that new opportunities may be on the horizon for you.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Wallet" (page 467).
A wallet in a dream means getting married or begetting a son. A wallet in a dream also represents money placed in a wallet, or it could represent a key. If one's wallet falls in a sea or in a river, it means loss of one's capital at the hand of people in authority. Ifit falls into a fire, it means losing one's money to a greedy, envious and an unjust person. It is also said that one's wallet in a dream could represent his body. If one's wallet is taken away from him in a dream, it means his death. Carrying a money belt in a dream means having knowledge one has earned in the first half of his life. If it contains some change only in the dream, it means that one has to pursue the path of knowledge and further his studies.
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.