Referring to it as the 737-8 is consistent with their current branding lineup. See other numerous examples 747-8, 787-9 or 777-9. Similarly the 737-800 is wide

Referring to it as the 737-8 is consistent with their current branding lineup. See other numerous examples 747-8, 787-9 or 777-9. Similarly the 737-800 is widely just referred to as the 737-800 and not the 737 Next Generation 800.