Get validation error message of array fields in laravel without displaying array key

I have an auto generated fields using jquery and my problem now is how to get error message without showing the index key. This is my code below:

@for($num = 0; $num < old('number', 1); $num++)
    <input type="text" class="form-control guest_name" name="last_name[]" id="last_name" placeholder="lastname" value="">
    @if ($errors->has('last_name' . ($num)))
        <div class="form-group">
            <p class="text-danger"></p>
        </div>
    @endif
@endfor

This is my validation:

for($i=0; $i < count($this->request->get('last_name')); $i++){
    $rules['last_name'.$i] = ['required'];
}
return $rules;

And now, the validation message is like this:

last name0 is required.

How can I just display it as last name is required.?

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