From: Bulbapedia - http://bulbapedia.bulbagarden.net/wiki/Brock
Most official sources do not give Brock a last name. However, several sources suggest that in the anime, his last name is Harrison. In the July 2006 issue of K-Zone Magazine, Eric Stuart was interviewed and stated that Brock's last name is Harrison.
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Iris Cuasorome is a character in Pokemon.
Ash's last name is Ketchum in Pokémon.
In the Pokemon anime, the only two characters to have last names are Ash Ketchum and Tracey Sketchit, so Dawn really has no last name. However, in many Pokemon Fan Fictions her last name is commonly referred to as Berlitz.
Serena's last name has not been mentioned in the Anime, game, or on any Pokemon wiki.
Im guessing they liked brocks eyes seems to be always closed (thats how he's drawn)