What is 'Dvn2' stand for? I started a regtest bitcoin network. Then I found most of my UTXOs are sending to a bitcoin address 'msvXYdtdhgWefyKPym2HnSmTUkxUsiDvn2'. The address is belongs to account 'Dvn2'. What is 'Dvn2' stand for?
Nothing. Account names don't mean anything. You must have given it that name.

There is no relation between the address and the account name. I assume you accidentally called an RPC passing Dvn2 as name.