English clemmed is related to German verklemmen, Yiddish farklemn, and Old English beclemman (link). Though Wigan may have a Celtic etymology, I don't see what Celtic placenames have to do with an English word of Germanic origin.

make a connection between Celtic and Yiddish

FWIW, they are related because they are both Indo-European languages.

Ceci n'est pas un seing.