Personally, I don’t think “nationalist anarchist” even makes sense as a term. Nonetheless, there is a group in the Bay Area that claims this is their ideology (see National Anarchism on wikipedia). You have to significantly distort anarchism to think you can hold nationalist view in parallel with your anarchist principles. Anarchism seeks a stateless society, so nationalism becomes meaningless in that worldview. Similarly, I think “national socialism”–the Nazi propaganda term for their regime–is a misnomer. A core value of socialism and anarchism is challenging the nation-state model and its perverted ideology, nationalism.
To quote Ms Goldman,
“‘Patriotism, sir, is the last resort of scoundrels,’ said Dr. Samuel Johnson. Leo Tolstoy, the greatest anti-patriot of our time, defines patriotism as the principle that will justify the training of wholesale murderers; a trade that requires better equipment in the exercise of man-killing than the making of such necessities as shoes, clothing, and houses; a trade that guarantees better returns and greater glory than that of the honest workingman.”