古英語のilcaから、同様に、PIE*iのthat, there, itから、語源的にはidem, identical, -lic, of same kindと同じ、語源的にはlike, -lyと同じ。
英語の語源
ilk
ilk: [OE] Historically ilk means simply ‘same’. Its Old English form was ilca, which was ultimately a compound made up of the demonstrative particle *i- ‘that (same)’ and *līk- ‘form’ (as in the English verb like). It had virtually died out by the mid-16th century as a straight synonym for same, but one context in which it survived, particularly in Scottish English, was in the increasingly fossilized phrase of that ilk ‘of the same’, which was used originally to express the notion that someone’s name was the same as that of the place they came from: thus Nairn of that ilk would have signified ‘someone called Nairn from a place called Nairn’.
In due course it came to be applied specifically to landed Scottish families, and so strong did the connection with ‘family’ become that by the 19th century we see the first signs of ilk being treated as if it were a noun, meaning ‘family’. That led on in time to an even more general sense ‘type, sort’, capable of use in such expressions as ‘of a different ilk’.
ilk (adj.)
Old English ilca "same" (n. and adj.), from Proto-Germanic *ij-lik, in which the first element is from the PIE demonstrative particle *i- (see yon) and the second is that in Old English -lic "form" (see like). Of similar formation are which and such. Phrase of that ilk implies coincidence of name and estate, as in Lundie of Lundie; applied usually to families, so by c. 1790 it began to be used with meaning "family," then broadening to "type, sort."
例文
1. He currently terrorises politicians and their ilk on "Newsnight "
彼の現在の『ニュースの夜』番組での発言は政治家たちを不安にさせた。the world of media people and their ilk
ニュースメディアのような人たち
3.Here we investigated whether integrin - linked kinase ( ILK ) may regulate LV remodeling and function after myocardial infarction.
本研究では、整合体関連筋酵素（ ILK ）が心筋梗塞後の左室再形成及び機能を調節できるかどうかを調査した。
4. ILK ，α-SMA and Vimentin in renal tubular epithelial cells were detected by immunohistochemistry analysis.
免疫組織化学法腎小管上皮細胞α-平滑筋アクチン（α-SMA）、波形蛋白（Vimentin）と ILK の発現を検出した。
5.Results In normal kidney tissues， ILK was mainly located in the glomerular visceral epithelialcells.