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. Result: null (json null) Examples: > bitcoin-cli setlabel "bc1q09vm5lfy0j5reeulh4x5752q25uqqvz34hufdl" "tabby" > curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "setlabel", "params": ["bc1q09vm5lfy0j5reeulh4x5752q25uqqvz34hufdl", "tabby"]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/