köken: Formed in another Indo-Iranian language, equivalent to the common Ossetian кӕф (kæf, “fish”) compounded with well-known Romani jaro which is with their usual prejotation and cluster reduction from Proto-Indo-Aryan *Hāndrám (Sanskrit आण्ड (āṇḍa, “egg”)), so literally “fish-eggs”.
köken: From Japanese イクラ (ikura, “salmon roe, salmon eggs”), from Russian икра́ (ikrá, “fish eggs, caviar”), from Proto-Slavic *jьkrā, from Proto-Indo-European *ikʷ(e)r- (“fish egg”), perhaps from Proto-Indo-European *Hyékʷr̥ (“liver”).
Borrowed from Russian икра́ (ikrá, “fish eggs, caviar”). First cited in Japanese in 1928. Appears to have displaced older 鮞 (hararago, “roe, particularly salmon roe”). May have first been used as a caviar replacement by Russian soldiers during the Russo-Japanese War (1904–05). Introduced to the Japanese market in the mid-1920s at the start of the Shōwa era as a kind of カビア (kabia), the older form…