The story you may have heardThe extracted draft started from Arabic lawzīnaj 'almond pastry', a derivation some food writers suggest (it is also proposed for lozenge). No standard dictionary supports it: Treccani, Merriam-Webster, Etymonline and Wiktionary's main line all derive lasagna from Latin lasanum, Greek lásanon, and Romans were using the Latin word a thousand years before Arab cooking reached Italy.