This is another case in which a wide ranging species has been split due to genetics work (see citation below). Although it was previously been considered a subspecies of C. tullia, it is now elevated to species. C. tullia does remain in AK and Yukon, but the rest of North America is C. california and it has the English common name of California Ringlet. The name Common Ringlet already exists in the world for Ypthima doleta and California Ringlet was already the name for C tullia california, so when it changed to full species, C. california, most changed English name to California Ringlet.
Here is the nomenclature as presented by Butterflies of Americas (the authority list)
Coenonympha california Westwood, 1851 Common Ringlet ref.11 iN
Coenonympha california nipisiquit McDunnough, 1939 salt marshes in NB & QC (Canada). Layberry et al. (1998), Webster (1999), and Sei … M T S
Coenonympha california mcisaaci dos Passos, 1935 TL: Canada (NL) M T S
Coenonympha california inornata W. H. Edwards, 1861 TL: Canada (MB) M T S L Ha
Coenonympha california benjamini McDunnough, 1928 TL: Canada (AB) M S L Ha
Coenonympha california mackenziei D. Davenport, 1936 TL: Canada (NT) M T S
Coenonympha california insulana McDunnough, 1928 TL: Canada (BC) M S L
Coenonympha california yontocket Porter & Mattoon, 1989 TL: USA (Ca) M T1 T2 S
Coenonympha california eryngii H. Edwards, 1877 TL: USA (Ca) M T S L Ha
Coenonympha california california Westwood, 1851 TL: USA (Ca) M T S L1 L2 I Ha
Coenonympha california columbiana McDunnough, 1928 TL: Canada (BC) M S L
Coenonympha california eunomia (Dornfeld, 1967) TL: USA (Or) M T S L Ha
Coenonympha california ampelos W. H. Edwards, 1871 TL: USA (Ca/Or) M T S1 S2 L I Ha
Coenonympha california mono Burdick, 1942 TL: USA (Ca) M S L
Coenonympha california elko W. H. Edwards, 1881 TL: USA (Nv) M S1 S2
Coenonympha california ochracea W. H. Edwards, 1861 TL: USA ([Co]) M T S L Ha
Coenonympha california pseudobrenda Austin & R. Gray, 1998 TL: USA (Nv) M S1 S2 L
Coenonympha california furcae W. Barnes & Benjamin, 1926 TL: USA (Az) M T S
Coenonympha california subfusca W. Barnes & Benjamin, 1926 TL: USA (Az) M T S L Ha
Literature Cited:
Zhang, Jing; Cong, Qian; Opler, Paul A.; Grishin, Nick V. (6 November 2020). “Genomic evidence suggests further changes of butterfly names” (PDF). The Taxonomic Report of the International Lepidoptera Survey . 8 (7). eISSN 2643-4806