If google info is anything to go by, geoname-lookup also shows names that are not expected along with right results.
I tried http://geoname-lookup.ubuntu.com/?query=New York. Result was : [{"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York borg", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "Lungsod ng New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "New York kenti", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }]
According to wiki, New York borg stands for New York City(NYC) in Icelandic; Lungsod ng New York stands for NYC in Filipino and New York kenti is NYC in Turkish.
Search for http://geoname-lookup.ubuntu.com/?query=New York City gives:
 [{"name" : "New York City", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }, {"name" : "The City of New York", "admin1" : "New York", "country" : "United States", "longitude" : "-74.005970", "latitude" : "40.714270" }].
What I intend to say is:
1. There's no necessity to include city names in languages other than English when one's chosen language is English.
2. If at all it should be included, then it should be included in a relevant list. 

Hope that helps.

As with * check if ubiquity is doing the correct requests / caching of the geodata / timezones, I don't know how to go about it.
If you can let me have more info, I'd be glad to do the checks. But a simple mouse click test says that not all is well with the geonames. Going to raise a bug for that and will post the link here.