Got it from the FFXII Artbook. Most of the six Moogle siblings live in Rabanastre, with two of them travlerers.
Mont Blanc: Head of Clan Centurio
Gurdy: Chocobo Attendant. Present in any location that offers Chocobos.
Nono: Strahl Mechanic.
Hurdy, Horne, Sorbet: Moogling Attendants