I really don't think surname has anything to do with suite upgrades, but rather it really depends on whether you are a real diamond member or a cubic zirconia.
I am Asian and I am at 99% suite upgrade last year (2012) with Hilton, Double Tree, Conrad and W/A (hope I don't jinx myself). I have stayed at the following properties:
HSW (roughy 10 times ~ 22 nights).
HOTP* (roughly 15 times ~ 20 nights).
Conrad HK (3 times ~ 9 nights).
Hilton KL Sentral (6 times ~ 15 nights)
Intermark Doubletree KL (one ~ 3 nights)
Parmelia Hilton (5 times ~ 30 nights)
Hilton Sydney# (twice ~ 2 nights)
Hilton Singapore (twice ~ 4 nights)
Hilton Shanghai (once ~ 2 nights, no suite upgrade due to renovation)
W/A Shanghai (One ~ 2 nights)
* For HOTP, I became quite friendly with the front desk manager and always email her ahead of my arrival.
# I booked once for a colleague using my free night cert and suite upgrade was confirmed at time of booking. Did the same for SWMBO and got the same treatment.
Essentially, I was told that due to the influx of the number of status matched diamond, they have been selectively upgrading members, depending on the occupancy rate of the Hotel. I had a stay in Conrad HK during the October golden week where the hotel was fully booked, and I could check in 9am, check out 3pm the next day and had a suite. In short, they do definitely look at your stay history and decide which member has upgrade priority.
I am Asian and I am at 99% suite upgrade last year (2012) with Hilton, Double Tree, Conrad and W/A (hope I don't jinx myself). I have stayed at the following properties:
HSW (roughy 10 times ~ 22 nights).
HOTP* (roughly 15 times ~ 20 nights).
Conrad HK (3 times ~ 9 nights).
Hilton KL Sentral (6 times ~ 15 nights)
Intermark Doubletree KL (one ~ 3 nights)
Parmelia Hilton (5 times ~ 30 nights)
Hilton Sydney# (twice ~ 2 nights)
Hilton Singapore (twice ~ 4 nights)
Hilton Shanghai (once ~ 2 nights, no suite upgrade due to renovation)
W/A Shanghai (One ~ 2 nights)
* For HOTP, I became quite friendly with the front desk manager and always email her ahead of my arrival.
# I booked once for a colleague using my free night cert and suite upgrade was confirmed at time of booking. Did the same for SWMBO and got the same treatment.
Essentially, I was told that due to the influx of the number of status matched diamond, they have been selectively upgrading members, depending on the occupancy rate of the Hotel. I had a stay in Conrad HK during the October golden week where the hotel was fully booked, and I could check in 9am, check out 3pm the next day and had a suite. In short, they do definitely look at your stay history and decide which member has upgrade priority.