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LandOfOz It seems not.
Any good dictionary will give the etymology of a word, and my copy of Chambers Handy Dictionary gives these, showing no clear reference to shape.
Pen: Old French
penne = a feather (for centuries, pens were quills.)
Pencil: Latin.
penicillum = A painter's brush.
Penicillin has the same root, presumably from the shape of the mould that is the medicine's source.
Penetrate : Latin.
penetrare - penitus = inward.
Peninsula : Latin.
paene* =almost, +
insula = an island.
Penis: Latin. I.e. it was always that word since the Romans or their predecessors coined it. We might speculate that the Romans equated 'penis' and 'penetrare' but I will leave it to Latin scholars to verify or refute that.
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* Not to be confused with
paean, a song or poem of triumph or joy; originally a Greek name for the god Apollo.
