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Alexander Sharon is 100% correct.
The name which is rendered Yekutiel was pronounced throughout Poland and
Galicia "Yekisiel" (this is a matter of fact, not opinion) an indeed is still
pronounced that way by those with roots in Poland and Galicia.
In common with other Hebrew names beginning with Ye- (e.g. Yechezkel,
Yerachmiel), the initial Ye- was frequently dropped, leaving Kisiel.
The name Kasriel is a different name.