#!/bin/bash

comp="LP"
n_names="abc456.com,def123.com,w xy098.com"
IFS=',' read -r -a n_split_list <<< "$n_names"

IFS=, read -ra "$comp"_list < <(printf '%s,' "${n_split_list[@]}")
export ${comp}_list

# check content of new array
declare -p ${comp}_list