From Muppet Wiki

The many names and voices of Cookie Monster across the globe. Although occasionally Cookie will be given an actual name or nickname, like "Lucas" in Mexico and "Triki" in Spain, his localized name is usually fairly literal translation of "Cookie" (or the local equivalent) and "Monster." His personality is generally consistent, although in the Netherlands, "Koekiemonster" speaks correct grammar.

Country/Show	Name	Performer	Picture
Denmark, Sesam, luk dig op	Kage Monster	Unknown
France, 1, Rue Sesame	Macaron	Georges Atlas
France, Les Chansons de 1, Rue Sésame album	Macaron	Francois Ossent
Germany, Sesamstrasse, 1974-1977	Krümelmonster; "Krümel" means "crumbs"	Alexander Welbat
Germany, Sesamstrasse, 1977-1994	Krümelmonster	Edgar Ott
Germany, Sesamstrasse, 1994-present	Krümelmonster	Douglas Welbat
India, Galli Galli Sim Sim	Biskut Badshaah	Unknown
Israel, Rechov Sumsum	Oogi ha-Mifletzet (Oogi or Oogifletzet for short, עוגיפלצת)	Dov Reiser
Kuwait, Iftah Ya Simsim	Ka'aki	Unknown
Mexico, Plaza Sesamo, circa 1980s and 1990s	Lucas Comegalletas	Jorge Arvizu
Mexico, Plaza Sesamo, current	Lucas Comegalletas	Rene Garcia
The Netherlands, Sesamstraat, 1976-1980s	Koekiemonster	Peter Piekos
The Netherlands, Sesamstraat, 1980s to present	Koekiemonster	Hero Muller
Poland, Ulica Sezamkowa	Ciasteczkowy Potwór	Andrzej Arciszewski
Portugal, Rua Sésamo	Monstro das Bolachas	Marina Côrte-Real
Russia, Ulitsa Sezam	Korzhik	Unknown
Spain, Abrete Sesamo	Triki, Monstruo de las Gelletas	Hector Cantolla
Spain, Barrio Sesamo	Triki, Monstruo de las Gelletas	Javier Franquelo
Spain (Catalania), The Adventures of Elmo in Grouchland	Monstre de les Galetes	Toni Sevilla
Sweden, Sesam and Svenska Sesam	Kakmonstret	Ernst Günther
Taiwan, Sesame English	Pingkan Kuaishou	Unknown
Turkey, Susam Sokağı	Kurabiye Canavari	Unknown