Phineas

Alternate spelling of this name is Finneas, though, it becomes a different meaning with that spelling.

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The original "Phineas", in Hebrew, means "Oracle".

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In Greek, it means " mouth of brass".

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With the spelling as "Finneas", the name means "variant of Finn". The root name in this spelling is Finn, the Anglicanized version of the Irish "Fion" (which is pronounced "Finn").

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Adding "eas" to the end, this makes it say "variant of". So when this name is spelled "Finneas", it means "variant of Finn".

I have also loved the name Phineas since high school because of the beloved character in A Separate Peace. We're planning to name our son this, with nickname Finn. I see a number of sites including this one only reference the Old Testament character Phinehas as the name's origin whereas there is an ancient Greek oracle king Phineus as well (from Jason and the Argonauts mythology). We much prefer this latter namesake and sites which fail to include it are misleading. For this reason we will likely use the Greek "-us" spelling instead.

I've also heard that this name means "Oracle". (Which, when seeing that on this site one of the meanings is "Serpent's Mouth", makes sense.)