How to keep looping while condition is false and stop looping until the condition is true?

function nameInput(){
    nameOutput = prompt("Enter your name...");
    return nameOutput;
}

let result = nameInput();

    if (nameOutput == false){
        console.log("Must be filled !");
        nameOutput = prompt("Enter your name...");
        
    } else {
        document.write(`Hello, ${result} !`);
        console.log("Complete!");
    }