Variant of Marlow, from Old English meaning 'driftwood hill' or 'remnants of a lake.'
Marlo is one of those names whose modern charm is clearer than its single, fixed origin. It is often treated as a streamlined variant of Marlow or Marlowe, an English surname and place-name tied to Old English elements associated with a lake and what remains of it, often glossed as "remnants of a lake." In that reading, Marlo belongs to the family of surnames-turned-first-names that feel tailored, literary, and faintly aristocratic.
At the same time, some families have used it simply as an independent modern coinage, drawn by its sound rather than by a strict etymological pedigree. Its strongest cultural association is probably Marlo Thomas, born Margaret but nicknamed Marlo after a childhood mispronunciation of "Margo." Through Thomas, the name picked up a distinctly twentieth-century American aura: stylish, self-possessed, feminist, urban.
That matters, because names are shaped not just by dictionaries but by the people who make them visible. Marlo has since traveled easily across gender lines, though in recent decades it has often felt especially sleek and contemporary for girls. It carries echoes of the more literary Marlowe, including associations with Christopher Marlowe and the hardboiled detective Philip Marlowe, yet its clipped final vowel makes it feel lighter and more modern. The result is a name that sounds both tailored and free, literary without being heavy.