A random rearrangement of the letters in the name (anagram) will give Oran. Imagine that, only 11 babies in Wisconsin have the same name in 1915. Social Security Administration data, the first name Arno is not a popular baby boy's name in Wisconsin.
That's more than enough people named Arno to occupy the territory of Christmas Island (Australia) with an estimated population of 1,462 (as of June 30, 2010). As a last name Arno was the 19,933 rd most popular name in 2010. * Years where the name was given to 5 or fewer babies will show zero to respect privacy.