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English word loony comes from Latin -ticus, Latin luna, and later English lunatic (An insane person. Crazed, mad, insane, demented.)
-ticus (Latin)
luna (Latin)
(figuratively) a month. (figuratively) a night. A crescent shape. The Moon.
lunaticus (Latin)
Of, or living on, the moon. Epileptic, lunatic, moonstruck, crazy.
lunatic (English)
An insane person. Crazed, mad, insane, demented.
lunacy (English)
(of a person or group of people) The state of being mad, insanity. Something deeply misguided.. A cyclical mental disease, apparently linked to the lunar phases. Insanity implying legal irresponsibility.
loony (English)
(of a person) Insane.. (of a thing) Very silly, absurd. An insane or very foolish person.