yii\gii\generators\model\Generator::validateModelClass PHP Method

    public function validateModelClass()
    {
        if ($this->isReservedKeyword($this->modelClass)) {
            $this->addError('modelClass', 'Class name cannot be a reserved PHP keyword.');
        }
        if ((empty($this->tableName) || substr_compare($this->tableName, '*', -1, 1)) && $this->modelClass == '') {
            $this->addError('modelClass', 'Model Class cannot be blank if table name does not end with asterisk.');
        }
    }