Laravel 5.4 Undefined variable error - problem with controller?

I'm getting this error: Undefined variable: sales_rep_names (View: C:\wamp64\www\VLCMRenewals\resources\views\search\index.blade.php)

when I try adding a new search dropdown in my blade. This is the new code I've added that's causing the problem:

                
                    <!-- adding sales rep placeholder
                    Can we make this a drop-down menu?

                    
                    need to make sure "name=" is correct -->
                    <div class="form-group col-md-4">
                    <label class="mr-sm-2" >Sales Representative</label>
                    <select class="custom-select mr-sm-2" name="primary_sales_rep">
                    <option selected></option>
                        @if(count($sales_rep_names) >0)
                            @foreach ($sales_rep_names as $sales_rep_name)
                                <option value=''></option>
                            @endforeach
                        @endif
                        </select>
                    </div>

And here's an example of a dropdown that DOES work (I copied the format):

<div class="form-group col-md-4" >
<label class="mr-sm-2" >Manufacturer Name</label>
<select class="custom-select mr-sm-2" name="company">
<option selected></option>
@if(count($manufacturer_names) >0)
@foreach ($manufacturer_names as $manufacturer_name)
<option value=''></option>
@endforeach
@endif
</select>
</div>

Lastly, here's the code I have my in Controller (manufacturer and customer both work):

    public function index()
    {
        // will need to add Sales Rep here
        $customer_names = DB::table('dbo.contract_view')
            ->distinct()
            ->orderBy('Customer_Name','asc')
            ->get(['Customer_Name']);
        $manufacturer_names = DB::table('dbo.contract_view')
            ->distinct()
            ->orderBy('Manufacturer_Name','asc')
            ->get(['Manufacturer_Name']);

        // when I tested with product part number it also gave me an error with index.blade.php. maybe this is the wrong spot?
        $sales_rep_names = DB::table('dbo.contract_view')
        ->distinct()
        ->orderBy('Primary_Sales_Rep','asc')
        ->get(['Primary_Sales_Rep']);
        return view('search.index', ['customer_names' => $customer_names], ['manufacturer_names' => $manufacturer_names], ['sales_rep_names' => $sales_rep_names]);
        
    }

Any advice?

via Chebli Mohamed