HitResult check if i hit head bone

i do a LineTraceSingleByChannel and

 if (HitResult.BoneName == How to i reference head bone)
 {
 
 }

By name???

    if (OutHit.BoneName == "head")
    {
        UE_LOG(LogTemp, Warning, TEXT("head bone HITTED"));
    }
    else 
   {
        UE_LOG(LogTemp, Error, TEXT("NO head bone HITTED"));
    }

thanks helped heaps