Things are certainly moving in the right direction so you have a point. As an example, I've just googled "Manchester United" and got about 175m search results. I did the same using "Manchester City" and got 80m results. That latter number would probably have been a lot less a few years ago. SEO's measure these things much more scientifically and the story is that they are still significantly more popular than us but that might not be quite so true in 5 or 10 years.
Not sure if this the right thread to post but I was searching an old thread and stumbled upon this old post from PB and tried the same experiment.
3 years later and the numbers are vastly different:
Manchester City 629,000,000 (9 digit)
Manchester United 574,000,000 (9 digit)
More popular are the Manchester abbreviate club names:
Man City 16,140,000,000 (11 digit)
Man Utd 16,750,00,000 (11 digit)
Others:
Barcelona 10,130,000,000 (11 digit)
Real Madrid 8,450,000,00 (10 digit)
Chelsea 6,540,000,000 (10 digit)
Liverpool 4,710,000,000 (10 digit)
Arsenal 462,000,000 (9 digit)
Juventus 209,000,000 ( 9digit)
Tottenham 207,000,000 (9 digit)
Not what this all means but certainly good or bad we are in the conscious of a shit load of people and with our raggy neigbours way ahead of anyone else.