No one knows every one has a different opinion
lycos
Kelsey was among the top 50 most popular names for girls during the 90's. 2007 the name Kelsey was the 201st most popular girl name in the United States.
This website (http://www.varologic.com/blog/post/2008/07/18/iPhone-3G-Accessories.aspx ) contains the 50 most popular apple iPhone accessories while (http://www.toptenguru.com/technology/top-ten-most-popular-apple-iphone-accessories-2011.html) contain the top ten. They have some similarities but all are popular so choose as you like.
I'd say under rank 50.
cocker spaniels were a very popular dog breed
According to crayola.com Blue and Cerulean which is a lighter blue check out the top 50 crayons here: http://www.crayola.com/colorcensus/americas_favorites/index.cfm
windfield red 50 in Iran.
The most popular lifeline used in Who Wants To Be A Millionaire when Regis Philbin was the host from 1999 to 2002 was "50/50".
The most popular cosmeti surgery done on women over 50 is a face and neck tightening procedure and a tummy tuck. These are the areas in a women that tend to sag the most.
One can find the top 50 songs of 2012 on many different sites. Many of these sites are opinions but a very popular site that has many such opinions is Youtube.
Great Britain
I'd have to say 'The Gumby Show' .