What is the English word for the sound produced by the gecko?

A "chirp"?

They make the most fantastically unlizard-like sound whose transliteration resulted in both the word "gecko" and the word "Tokay". When you first hear it, you have to convince yourself that a lizard rather than a small child is making the sound.

They are named for their unique chirping or clicking noises, which sound like the word gecko. Geckos are the only lizards that make a clicking noise.

http://www.thegeckospot.net/leocareindex3.php

http://www.wildherps.com/species/G.gecko.html

Certain species of this family make a loud clicking noise that sounds like “gecko”; they are the only lizards that make any sound other than hissing.

http://www.sciencehub4kids.com/geckoreptiles-and-amphibians/

Might it be "gecko"?

"Certain species of this family make a loud clicking noise that sounds like “gecko”"

http://www.enchantedlearning.com/subjects/reptiles/lizard/Gecko.shtml

Geico Insurance (British accent)

http://www.unsolvedmysteries.com/usm446390.html

In Indonesia they call him Cakcak, so maybe that's what he's really saying?

http://su.wikipedia.org/wiki/Cakcak

On this site you can listen to various geckos with different dialects. Decide for yourself what they're saying.

[gekkota.com/html/gecko_sounds.html] Link no longer exists