אײַזיק
'Isaac (name)'

WESTERN

Eisek {Friedrich 1784: XVI}

Alt Eisikl ward tänzerig warn die כ"ז pischerig.

Holland (Netherlands)

Eisek {HOLLAND, Beem, Jerosche}
- Alt Eisek wert tenzreg. 'Old Isaac is becoming tenzreg (= danslustig {wanting to dance}. Used for old people who behave young. Beem notes that the name includes change of long MHG /iː/ to /aj/, so the name must be very old.' {Jerosche №184}
Tendlau 1001 thinks, wrongly, that it is an English pronunciation.
Weill pag. 69.