The term 'Essayist's Pen Name' can be solved by the crossword solution ELIA, which is a four letter word. ELIA is the pen name of the English essayist Charles Lamb, who was born in 1775 and died in 1834. He was known for his humorous essays and poetry, and his works were published in various magazines and newspapers. Lamb was also a close friend of William Wordsworth and Samuel Taylor Coleridge.