What pseudonym did Claude Monet use when signing some early caricatures?

Claude Monet used the name Oscar Monet on some early caricatures.

Monet was born Oscar-Claude Monet in Paris in 1840, and “Oscar” was the name he commonly used in his youth. Before becoming known as a landscape painter, he gained local attention in Le Havre for humorous caricatures of townspeople. These drawings were often signed simply “Oscar,” helping establish his early artistic identity.

The caricatures were displayed in a shop window in Le Havre, where they attracted notice from Eugène Boudin. Boudin encouraged Monet to abandon studio-only drawing and paint directly outdoors. That encounter became an important step toward Monet’s later Impressionist practice.

“Oscar Monet” is not a separate artist from Claude Monet. Oscar was his first given name, while Claude was the name by which he became internationally famous.