Lewie is of English origin, derived from the Middle English 'Leofric', which means 'dear power'. It was traditionally a boys' name but has also been used occasionally for girls in recent times.
"The name Lewie saw a peak in popularity around World War I, with a notable spike in births between 1913 and 1916. However, it has since fallen out of favor, with fewer than 10 births per year recorded from the late 1940s onwards. In recent years, there have been just five births each in 2019 and 2020."