What is the origin of イレーザー?

Question

There is a word イレーザー, which means 'eraser'. I suspect this comes from the English word eraser. But the "s" sound in eraser is not voiced in American English, and a closer approximation in kana will be イレーサー. How did it become voiced as イレーザー?

Edit: After fefe's answer, it turned out I was wrong in writing that "s" is not voiced in English. It turned out to be true for American English.

Answer 1

According to Oxford Advanced Learner's Dictionary, the 's' is voiced in British English, and unvoiced in American English.

So イレーザー may come from the British reading.