Found 3 boys and girls with the meaning of rational
Alyssa / 6 letters 
Meaning of Alyssa In Teutonic, Alyssa means Good humor More
Ate / 3 letters 
Meaning of Ate In Greek, Ate means Goddess of irrationality More
Ophelia / 7 letters 
Meaning of Ophelia In French, Ophelia means Hamlet, Prince of Denmark' Daughter to Polonius More

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