What does Navy mean?
A modern word-name from English 'navy' (a nation's fleet, and the deep blue color named after naval uniforms), ultimately from Latin 'navis', ship. It has no older history as a personal name; its appeal is the color and the nautical association.
What does Marlowe mean?
An English habitational surname from Marlow in Buckinghamshire, from Old English 'mere' (lake, pool) + 'laf' (remnants, leavings), i.e. marshy ground left after a lake was drained. Often loosely glossed 'driftwood'. It also recalls the Elizabethan playwright Christopher Marlowe.