バージョン：Laravel 6.20.32

Laravelをインストールして、下記のテーブルのマイグレーションがデフォルトで作成される。

users
password_resets
failed_jobs

これらのテーブル名を変更した際に修正する必要のある箇所について。

usersのモデル、コントローラ、マイグレーションの修正、作成している場合はファクトリ、シーダの修正、ルーティングに記述している場合はルーティングも修正が必要。
password_resetsとfailed_jobsのマイグレーションの修正が必要。（モデル名、テーブル名を変更する際の修正箇所についてはこちらも参照。）

加えて下記の対応が必要。

config/auth.phpの修正
RegisterController.phpの修正

config/auth.phpの修正

下記の例は、モデル名を『DUser』、テーブル名を『d_users』、『d_password_resets』に変更した場合のもの。

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Authentication Defaults
    |--------------------------------------------------------------------------
    |
    | This option controls the default authentication "guard" and password
    | reset options for your application. You may change these defaults
    | as required, but they're a perfect start for most applications.
    |
    */

    'defaults' => [
        'guard' => 'web',
        'passwords' => 'd_users', // 'passwords'を下記の'passwords'にて修正した'd_users'に変更!!
    ],

    /*
    |--------------------------------------------------------------------------
    | Authentication Guards
    |--------------------------------------------------------------------------
    |
    | Next, you may define every authentication guard for your application.
    | Of course, a great default configuration has been defined for you
    | here which uses session storage and the Eloquent user provider.
    |
    | All authentication drivers have a user provider. This defines how the
    | users are actually retrieved out of your database or other storage
    | mechanisms used by this application to persist your user's data.
    |
    | Supported: "session", "token"
    |
    */

    'guards' => [
        'web' => [
            'driver' => 'session',
            'provider' => 'd_users', // 'provider'を下記の'providers'にて修正した'd_users'に変更!!
        ],

        'api' => [
            'driver' => 'token',
            'provider' => 'd_users', // 'provider'を下記の'providers'にて修正した'd_users'に変更!!
            'hash' => false,
        ],
    ],

    /*
    |--------------------------------------------------------------------------
    | User Providers
    |--------------------------------------------------------------------------
    |
    | All authentication drivers have a user provider. This defines how the
    | users are actually retrieved out of your database or other storage
    | mechanisms used by this application to persist your user's data.
    |
    | If you have multiple user tables or models you may configure multiple
    | sources which represent each model / table. These sources may then
    | be assigned to any extra authentication guards you have defined.
    |
    | Supported: "database", "eloquent"
    |
    */

    'providers' => [
        'd_users' => [ // usersからd_usersに変更!!
            'driver' => 'eloquent',
            'model' => App\DUser::class, // モデル名を変更!!
        ],

        // 'users' => [
        //     'driver' => 'database',
        //     'table' => 'users',
        // ],
    ],

    /*
    |--------------------------------------------------------------------------
    | Resetting Passwords
    |--------------------------------------------------------------------------
    |
    | You may specify multiple password reset configurations if you have more
    | than one user table or model in the application and you want to have
    | separate password reset settings based on the specific user types.
    |
    | The expire time is the number of minutes that the reset token should be
    | considered valid. This security feature keeps tokens short-lived so
    | they have less time to be guessed. You may change this as needed.
    |
    */

    'passwords' => [
        'd_users' => [ // usersからd_usersに変更!!
            'provider' => 'd_users', // 'provider'を上記の'providers'にて修正した'd_users'に変更!!
            'table' => 'd_password_resets', // テーブル名を変更!!
            'expire' => 60,
            'throttle' => 60,
        ],
    ],

    /*
    |--------------------------------------------------------------------------
    | Password Confirmation Timeout
    |--------------------------------------------------------------------------
    |
    | Here you may define the amount of seconds before a password confirmation
    | times out and the user is prompted to re-enter their password via the
    | confirmation screen. By default, the timeout lasts for three hours.
    |
    */

    'password_timeout' => 10800,

];

RegisterController.phpの修正

モデル名と、バリデーション部分を修正する。

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use App\Providers\RouteServiceProvider;
use App\DUser; // モデル名を変更!!
use Illuminate\Foundation\Auth\RegistersUsers;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Validator;

class RegisterController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Register Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users as well as their
    | validation and creation. By default this controller uses a trait to
    | provide this functionality without requiring any additional code.
    |
    */

    use RegistersUsers;

    /**
     * Where to redirect users after registration.
     *
     * @var string
     */
    protected $redirectTo = RouteServiceProvider::HOME;

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest');
    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'string', 'email', 'max:255', 'unique:d_users'], // バリデーションも変更!!
            'password' => ['required', 'string', 'min:8', 'confirmed'],
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return \App\DUser
     */
    protected function create(array $data)
    {
        return DUser::create([ // モデル名を変更!!
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => Hash::make($data['password']),
        ]);
    }
}