Hildur is of Icelandic origin, derived from the Old Norse name Hylldr, which is composed of the elements hylja, meaning 'to hide', and dróttning, signifying 'queen'. This name has a strong historical presence in Iceland, with notable bearers including Hildur Guðnadóttir, an acclaimed composer known for her scores in films such as "Joker" and "Chernobyl". In the language of flowers, Hildur is associated with the chrysanthemum, which symbolizes longevity and optimism.
The name Hildur experienced varying popularity over time, with a significant spike in usage during the late 1880s to early 1890s, peaking at 30 births in 1895. After this period, the number of babies named Hildur gradually declined until it reached its lowest point in the late 1920s and early 1930s, with only 6 births recorded in 1927 and again in 1933. Overall, there were 718 births registered with the name Hildur between 1885 and 1933.