You will find, here and there, stories about individual aristocrats who were sympathetic to the communist movements of the late 19th and early 20th. Lenin himself is one such example. However, these aristocrats generally didn't support socialism out of some conniving desire to undermine a rival class, but rather because they actually regarded socialism with some merit.

Rather than lend direct support to proletarian movements, feudal aristocrats who wanted to defend their class position attempted to undermine the bourgeoisie through a loosely cohesive political philosophy which Marx in the Communist Manifesto termed "feudal socialism":

In order to arouse sympathy, the aristocracy was obliged to lose sight, apparently, of its own interests, and to formulate their indictment against the bourgeoisie in the interest of the exploited working class alone. Thus, the aristocracy took their revenge by singing lampoons on their new masters and whispering in his ears sinister prophesies of coming catastrophe.

In this way arose feudal Socialism[.]

Marx's polemic isn't very helpful here, but the Great Soviet Encyclopedia has a good overview of who expounded this view and what it looked like:

a type of prescientific socialism, whose proponents, critical of capitalism, saw a possibility of transcending its contradictions in a return to patriarchal feudal relations... included among its representatives some French Legitimists, such as J. Villeneuve-Bargemont and C. Montalembert, as well as the Young England party, made up of aristocratic Tories, such as J. Manners and A. Ashley, who had grouped around B. Disraeli in the 1840’s...

Feudal socialism saw the historical process as the unfolding of a divine plan comprehended only by the elect. The task of the chosen few was to preserve the foundations of society, which had withstood the test of time, and to prevent the growth of “artificial” elements in society. According to feudal socialism, the establishment of political hegemony by the industrial bourgeoisie had resulted in the breakdown of traditional social bonds and given birth to anarchic masses egotistically pursuing individual goals. The return to an organic, cohesive society could be achieved only by ensuring that industrial civilization rested on a patriarchal and feudal social order. Such an order, deriving its authority from an eternal human nature, implied a social hierarchy, paternal and patriarchal bonds, stable traditions and rituals, and the sanctity of political institutions and the figures in whom they were embodied—monarchs, heroes, land magnates, and “captains of industry,” in Carlyle’s words.

I can't find any sources indicating anything, but then making generalisations about large groups is fraut with error. Safe to say though, it's highly unlikely that aristocrats would have supportive of communist ideals. In the very opening lines of the Communist Manifesto, the resistance by both aristocratic and bourgeois capitalists to communism is made clear (to a nearly comical effect).

"A spectre is haunting Europe -- the spectre of communism. All the powers of old Europe have entered into a holy alliance to exorcise this spectre: Pope and Tsar, Metternich and Guizot, French Radicals and German police-spies."

This is because communists were just as keen as taking the means of production from aristocrats as they were from the bourgeoisie. Its simply that in Marx's historiographical model, he highlighted that capitalism would be the destruction of the previous processes of production which he indicated was feudal manorialism. In the same way, he thought capitalism was creating communism and would ultimately be the destruction of it.

*Edit- removed "more than a ideological, theoretical support" in the first sentence.

I can only give you a small example of this from what I know. In Ireland during the early 20th century, with the wars in 1916 and 1919, a woman named Countess Markievicz who was from Ireland but married to Casimir Markievicz, a Russian noble, took up arms in those wars. She was part of the Irish Citizen Army who were the most left-wing group in the Easter Rising and had the ultimate goal of a Communist Irish Republic.

That is about as close as I can get for you with my own knowledge.

Although he came to prominence from the much later postwar period, the curious case of the television personality Karl-Eduard von Schnitzler fits. Von Schnitzler came from an ennobled banking family but became something like a precursor to Glenn Beck within the GDR. Although there were some other "vons" of the former aristocracy within the GDR's people's state, few occupied such a prominent media spot.