The setlabel RPC intended as a replacement for the deprecated 'account' API.
setlabel "address" "label"
*bitcoin-cli help setlabel
setlabel "address" "label" Sets the label associated with the given address. Arguments: 1. "address" (string, required) The bitcoin address to be associated with a label. 2. "label" (string, required) The label to assign to the address. Examples: > bitcoin-cli setlabel "1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX" "tabby" > curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "setlabel", "params": ["1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX", "tabby"] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/