Just something that popped into my head and I think crowdsourcing is the best way to go about it.

It might be useful for referees and scenario writers if a listing of spaceport bar (Or Spaceport Bar franchise) names from existing scenarios and supplements (All flavors of Traveller) is compiled. I am going to start with the 'elephants in the room' so as to give some idea of what I am aiming for.

Brubecks - GURPS Traveller: Starports

A franchise set-up that offers a standardized experience, 200 units exist scattered across the Third Imperium and the Solomani Confederation in various A, B & C class ports, the writeup implies the franchise originated in the Solomani

Confederation and spread into the Third Imperium.

GenEric! Bar & Steakhouse - Mongoose Traveller: Referees Briefing 3 - Going Portside

Another franchise setup that offers a standardized experience.

Brewhouse Tavern - Mongoose Traveller: Referees Briefing 3 - Going Portside

Franchised MicroBrewery, specializes in 'local themed/sourced' food.

Landing Deck - Mongoose Traveller: Referees Briefing 3 - Going Portside

Starship themed bar. Description is of a one-off establishment rather than a franchise

Planetfall Bar & Grill - Mongoose Traveller: Referees Briefing 3 - Going Portside

Budget Bar , some establishments are part of a chain, others are simply using the name/concept without permission.

The Torpedo Bay

Imperial Navy themed bar, implied to be a pseudo-franchise (e.g. the concept has been copied widely, but there is no franchising organization.)

None of the Mongoose writeups give any idea of what size of ports these would be most likely associated, my 'gut instinct' would be much the same as Brubecks (A, B & C).

And to finish this post, one culled from the scenario 'After The Fact' published in the Third Imperium fanzine, Issue 9

Eneri's Starport Bar & Grill

No specifics are given in the scenario other than it is located on Iilgan (Tobia 0309), which has a class C port.