The addresses of Ethereum wallets are anonymous. However, if the user fails to hide their IP address, it is traceable.
Some tools can leverage smart contracts and privacy-focused cryptography, known as zero-knowledge proofs, to send Ether anonymously.
It would be best to term Ethereum transactions, which are pseudo-anonymous, as tracing the identity of an Ethereum wallet owner would require extensive chain analysis and data mining skills.
In general, the source wallet address remains stamped on any Ethereum transaction.