First, the easy part... the eight noble clans:
Caxki
Ki'ra
Kiranka
Kur'u'tak (^1)
Qarg
Ragitagha (^2)
Sihkag
Sutaghi
(^1) - Also spelled without the apostrophes, "Kurutak".
(^2) - All eight noble clans contain 'nar', except some instances of Ragitagha where no modifier is present (ie, Najji Ragitagha)
Then, those that are certainly clans because they have a 'nar':
Dhollas
Dhores
Ghorah Khar
Hhallas
Ja'targk
Khirg
Kulrag
N'Ryllis
Poghath
Som'mers
T'Agg A'Bren
Ta'hal
Tsahl
Val
Vharr
Volles
It's implied that each planet has a clan (nar Ghorah Khar, nar Hhallas), though -- so take that into account...
Then those that are probably clans despite being 'nameless' (like Ragitagha sometimes is):
Kaligara
Jhorrad
It's known that, at least in the case of Dawx Jhorrad, that the lack of a nar means that said Kilrathi is a commoner.
Then there's the 'other' modifiers from False Colors... which are a bit confusing.
We have 'lan', 'dai', 'ko', 'jaq' and 'lak' used in place of 'nar'.
Furthermore, we have 'dai' and 'lak' used together in the *same* name (Ukar dai Ragark lak Haka) meaning that they don't indicate clan. To confuse this further, Largka Cakg dai Nokhtak and Murragh Cakg dai Nokhtak both *lack* the 'lak' (try saying that three times fast).
Ragark was supposedly trying to start the 'Haka Dynasty', so it's reasonable to assume that his 'clan' is the Haka. You might referr to Largka and Murragh's family as "Cakg dai Nokhtak" or simply "Nokhtak".
Finally, we see these others:
lan Dorv
lan Mraal
ko Lannis
Jaq Rhang