There's also two separate oranges in English. The Dutch Royal house from a town in Southern France which the Romans called Aurasio (today called Orange in French and Aurenja in Occitan) and the citrus fruit. The later seems to have come into European languages via Italian melarancio (from mela 'apple' and arancio 'orange', which the French calqued as pome (d')orenge, from the same French dictionary entry linked to above. But, it seems likely to me, too, that orange is not like adder or newt.

Ceci n'est pas un seing.