Tilo was an alias used by Ro Laren while in command of the Orb of Peace in late 2373. As the Orb was a former-Bajoran transport that had been acquired by the Maquis, the transport was ordered to proceed to Bajor with Maquis evacuees from Galion under a Bajoran flag. Ro had to assume an alias and the only other Bajoran on board, Shon Navo, was forced to pose as first officer.
Shortly after leaving Galion, the Orb was approached by two Jem'Hadar fighters and Ro had to use her alias to convince them that the Orb was a diplomatic transport en route back to Bajor after concluding trade negotiations with the Dominion. (TNG - The Dominion War novel: Behind Enemy Lines)