Thelma meaning unknown. It was a rare name when British author Marie Corelli used it for the Norwegian heroine of her novel 'Thelma' (1887). The name became popular around the end of the 19th century after the novel was published. It is sometimes claimed to derive from Greek θελημα (thelema) meaning "will", though this seems unlikely.
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Names related to Thelma through nicknames, language, or historical forms.