The current list in game of rF2 circuits that have their corners named is as follows. Where there are duplicated listed that is because there are different versions of the same circuit created by different modders or a circuit has several layouts and each layout carries the same name. To find out in game if CC knows the corner names then ask him "Corner names?" and he will tell you the names as you drive through them from that point on circuit until the start finish straight.
If anyone wants to add to the circuits in game you may find http://www.racingcircuits.info/ useful for the corner names .
1966 Brianza
1966 Monte Carlo
200", "Snetterton200
300", "Snetterton300
60sHockenheim
75Kyalami
Adelaide 1988
Adelaide Street Circuit
Alabama Superspeedway
Apple Valley Speedway
Assen TT Circuit
Barbagallo_short
Barbagallo", "Barbagallo2013
Barber Motorsports Park
Barber Motorsports Park 2015
Bathurst
BATHURST2016
Belgium
Brands Hatch GP
Brands Hatch INDY", "Brands
Brianza 10K
Brianza Junior
Bristol Motor Speedway
Brookdale Speedway
CadwellParkSRW
Canadian Tire Motorsport Park (after 2013)", "Mosport Park
Castle Combe classic
Castle Combe modern
Circuit de la Sarthe
Circuito Monteblanco Variante 1
Circuito Monteblanco Variante 10
Circuito Monteblanco Variante 10
Circuito Monteblanco Variante 2
Circuito Monteblanco Variante 2ch2
Circuito Monteblanco Variante 3
Circuito Monteblanco Variante 4
Circuito Monteblanco Variante 4ch3
Circuito Monteblanco Variante 5
Circuito Monteblanco Variante 6
Circuito Monteblanco Variante 7
Croft -- Road Course
Daytona International Speedway
Daytona International Speedway
Detroit 1988
Dijon-Prenois
Dijon-Prenois
Donington Park GP Circuit
Donington Park National Circuit
Dover International Speedway
Eagle Creek Speedway
Estoril 1988
Full Course
Guia_Circuit
Hermanos Rodriguez 1988
Hockenheim 1988
Hockenheimring
HockenheimRing DT
Hungaroring 1988
Imola 1988
Indianapolis - 2007 GP
Indianapolis - 2013 GP
Indianapolis - 2014 GP
Indianapolis - Brickyard", "Indianapolis - Oval
Indianapolis -- Oval
Jacarepagua 1988
Jacksonville Superspeedway
Jerez 1988
Joseville Speedway
Kansas Speedway
Knockhill11
Las Vagas Motor Speedway
Lausitzring Grand Prix long
Lausitzring Grand Prix short
lausitzring superspeedway
Le Bugatti Circuit
LeMans91
Lime Rock Park -- All Chicanes
Lime Rock Park -- No Chicanes
Lime Rock Park -- Uphill Chicane
Lime Rock Park -- West Bend Chicane
Loch Drummond - Long Layout
Loch Drummond - Short Layout
Long_Beech_2014
Longford 1967
Louisiana -- Indy Grand Prixp
Magnificent_Park_Endurance
Magnificent_Park_International GP
Magnificent_Park_National GP
Magny-Cours
Malaysian Full Loop
Mantorp Park
Martinsville Speedway
Matsusaka East Circuit
Matsusaka Grand Prix Circuit", "Matsusaka International Circuit
Matsusaka International Old Chicane
Matsusaka International West Chicane
Matsusaka Motorcycle Circuit
Matsusaka West - West Chicane
Matsusaka West Circuit
Mazda Raceway Laguna Seca
Mazda Raceway Laguna Seca
Michigan International Speedway
Mid-Ohio No Chican
Mid-Ohio With Chicane
Mills Inner Loop A
Mills Inner Loop B
Mills Inner Loop C
Mills Outer Loop A
Mills Outer Loop B
Mills Outer Loop C
Misano World Circuit Grand Prix
Monte Carlo 1988
Montreal 1988
Monza 1988
Mores - Short Layout
Mountain Peak - Legends Oval
mountain peak speedway
mountainpeak road course
New Hampshire Motor Speedway
Nogaro
NolaMP -- B - Course
NolaMP -- C - Course
NolaMP -- D - Course
Norising
Norisring
Northside International Racewa
Nuerburg GP
Nuerburg Sprint
Oschersleben Motorsport Park
Oschersleben Motorsport Park
Oschersleben Motorsport Park
Oschersleben_MC
Oulton Park Fosters
Oulton Park International
Oulton Park International NC
Oulton Park Island
Palm Beach Intl Road Course
Palm Springs Road Course A
Palm Springs Road Course B
Palm Springs Speedway
Paul Ricard 1988
Paul Ricard HTTT
Paul Ricard HTTT
Paul Ricard HTTT
Pembrey
Phakisa
Phoenix
Pocono Raceway
Portimao Circuit
Portland International Raceway Chicane
Portland International Raceway No Chicane
Portugal GP Layout
Portugal GT Layout
Poznan Circuit -- Race Weekend
Poznan Circuit -- Track Day
PrinceGeorgeCircuit
RaceRfactor Austin 2013
RaceRfactor Austria 201
RaceRfactor Barcelona 2013
RaceRfactor China 2014
RaceRfactor Hungaroring 2013
RacerFactor Melbourne 2013
RaceRfactor Mexico 2015
RaceRfactor Monaco 2013
RaceRfactor Montreal 2013", "Montreal GP
RaceRfactor Monza 2014
RaceRfactor Singapur 2013
RaceRfactor Sochi 2014
RaceRfactor Spa 2013
RacerFactor Suzuka 2013
RaceRfactor Yas Marina 2013
Road America
Road America 2016
Road America 2016
RockinghamBTCC
Rouen 1955-70
Sachsenring
SaoPaulo GP
Sardian Heights Long
Sardian Heights Short
Sebring Club Course
Sebring Modified Course
Silverstone -- National Layout
Silverstone 1988
Spa Francorchamps 1988
Suzuka 1988
VIR Grand Course
VIR North Course
VIR Patriot Course
VIR South Course