A small recapitulation so far (and then some):
XH-44 HILLER-COPTER (NOT a military designation!)
X-2-235 HILLER-COPTER
NC-5 / UH-5B (J-5) ROTOR-MATIC
J-10 world's first helicopter with a NOTAR system
UH-4 COMMUTER
360X "YELLOW PEARL" prototype of the 360 / UH-12 line
360 civilian demonstrator that started the UH-12 series
UH-12 civilian helicopter and YH-23 RAVEN for USAF
UH-12A civilian helicopter / Army (O)H-23A RAVEN / Navy HTE-1
UH-12B civilian helicopter / Army (O)H-23B RAVEN / Navy HTE-2 / Royal Navy HT.Mk.1
UH-12C civilian helicopter / Army (O)H-23C RAVEN
UH-12D civilian helicopter / Army (O/U)H-23D RAVEN
UH-12D-1 civilian helicopter
UH-12E civilian helicopter / Army H-23E RAVEN / Army OH-23G RAVEN / Canada CH-112 NOMAD / Royal Navy HT.Mk.2 RAVEN
UH-12EL
UH-12ET
UH-12E-3
UH-12E-3T
UH-12E-4 civilian helicopter / Army (O)H-23F RAVEN (also known as Model E-4 STATION WAGON)
UH-12E-4
UH-12E-4T
UH-12E-5
UH-12E-5T
UH-12J-3
UH-12L
UH-12L-4 (also known as Model L-4)
UH-12SL
UH-12SL-4 (also known as Model SL-4)
VJ100 passenger rocket project; test models only
HH-120 HORNET, prototype of the HJ-1 series
HJ-1 HORNET, small helicopter with rotor-tip jets (also found as J-1)
HJ-1 Navy XHOE-1 / Army YH-32 HORNET
HJ-1 Army YH-32A ULV HORNET "Sally Rand" (to TH-32A)
LZ-5-2 Development of Doman LZ-5 (acquired by Hiller)
8RJ2B Hiller-designed ramjet, the first US-designed jet engine of any kind to be approved for production by the CAA
697 X-16 competition proposal
720 combination of two Model 360 helicopters
1005 crane helicopter project (AERIAL CARRYALL?)
1031(-A) AIRBORNE PERSONAL PLATFORM designed upon Charles Zimmerman concepts (ONR evaluation)
1031-A-1 FLYING PLATFORM, procured by Army as VZ-1E PAWNEE
1033 XROE-1 ROTORCYCLE for Navy; cancelled development was YROE-1
1035 first tilt-wing project under an Army contract; design began in 1953
1045 small tilt-wing transport project, proposed to Army for 1954 utility helicopter (lost to "Huey")
1048A first government-funded tilt-wing study contract, encouraged by ONR
1056 tiltrotor design in a comparative study for the Navy's BuAer
1057 tilt-wing design in a comparative study for the Navy's BuAer (the tilt-wing won)
1058 tilt-duct design in a comparative study for the Navy's BuAer
1059 deflected slipstream STOL aircraft project
1067 transport/rescue project based on X-18 design
1084 multipurpose/transport project based on X-18 design
1085 X-18 PROPELLOPLANE (1958)
1091* CAMEL (Collapsible Airborne Military Equipment Lifter)
1094DO CAMEL, a variant of Model 1091, no details
1098 STORC (Self-ferrying Trans-Ocean Rotary-wing Crane) tip turbojet helicopter
1099* TEN 99 Assault Support Helicopter proposal to USN; first PT6-powered helicopter (1961)
1100* Army HO-5/OH-5A helicopter (1963) / OH-5B variant proposal
FH-1100* commercial variant of OH-5 known by Fairchild-Hiller
RH-1100 B PEGASUS (Rogerson-Hiller)
RH-1100 M HORNET (Rogerson-Hiller)
RH-1100 S unbuilt seven-seat variant (Rogerson-Hiller)
FH-1108* Hiller-Continental FLYING CRANE, tip turbojet-powered very heavy-lift helicopter entry in Army program; won but was canceled soon after
FH-111?* PC-6 PORTER (FAIRCHILD-PILATUS)
1117 rotorcraft, no details
VHR-447 XC-142A VTOL transport (Vought-Hiller-Ryan) (=Vought V-464)
NOTE: a page of this forum shows a flying crane model "to perform midair recovery of the first stage of the Saturn 5" which is given erroneously as the Model 1045.
*asterisk indicates projects identified as Fairchild-Hiller