How do you say blue in other languages? In Latin it's caeruleum which is similar to the Latin word heaven in Latin.

Yes, the word for "blue" in Latin is derived from the word for "sky" (for obvious reasons).

Japanese it's [i]aoi[/i]
Ancient Greek it's [i]kyanos[/i] (source of the English word "cyan")
Catalan it's [i]blau[/i]

There's a "cerulean" in English as well (also means blue, comes from Latin caeruleus)
Azul - Spanish and Portuguese
Bleu or azur - French
Blu, azzuro, celeste - Italian
μπλε (ble) or γαλαζιος (galazios) - Greek
plavo - south Slavic languages

azul

Glas in Welsh. It can also mean green. You can see the link to Greek.

כחול-Hebrew

French “bleu”

azul- spanish and portuguese