Bitcoin Core is the official bitcoin wallet.
bitcoin core is the
reference implementation of bitcoin protocol. there is no such thing as "official" in a decentralized system because there is no centralized authority to release one.
Well said Satoshi Nakamoto did not designate any Bitcoin wallet in his time since it's open-sourced any person or company can create one and there's a lot of wallets now and more are coming up, the most popular wallets now are the multi-currency wallets like Atomic Exodus, because it's profitable business these kinds of wallet has a build-in exchange.