BACKGROUND: Many medical eponyms were established when women and racialized individuals were excluded from medicine. The objective of this study was to determine the gender and racialization status of individuals whose names are incorporated in medical eponyms. METHODS: This study is a cross-sectional analysis of gender and racialization of medical eponym namesakes. The main outcome measures were the study of gender and racialization of medical eponym namesakes found in Whonamedit, Mosby's Medical Dictionary, and the International Classification of Diseases (version 10). The gender and whether the individual was a racialized person were determined using pictures and other available information. RESULTS: We identified 3484 unique eponyms. White men represented the majority of medical eponym namesakes (2190 of 2327, 94.1%) followed by white women (85 of 2327, 3.7%), racialized men (49 of 2327, 2.1%), and racialized women (3 of 2327, 0.1%). In the ICD-10 sub-analysis, white men represented the majority of medical eponym namesakes (476 of 514, 92.6%) followed by white women (22 of 514, 4.3%), racialized men (14 of 514, 2.7%), and racialized women (2 of 514, 0.4%). CONCLUSION: Most medical eponyms represent men and white individuals, highlighting the underrepresentation of women and racialized individuals. This indicates a need to re-examine the ongoing use of medical eponyms which may entrench sexism and racism in medicine and contribute to an environment that makes some feel unwelcome or undervalued.