Corslet
The word "corslet" was adopted as a so-called "occupational surname , " later altered to Coslett , Cosslett , Coslet , etc . , following the arrival of an expert in the manufacture of osmond iron , Corslet Tinkhaus , to Wales from his native Westphalia in 1567 . 
<triplet> Coslett <subj> surname <obj> instance of <triplet> Cosslett <subj> surname <obj> instance of <triplet> Coslet <subj> surname <obj> instance of