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Rabbenu Tam's name was יעקב בן מאיר. Why then is he known as Rabbenu Tam?

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up vote 5 down vote accepted

I've heared that Rabbenu Tam made a gzeira that cancels the curse of "ו תם לריק כוחכם", hence he is called Tam.

Here is a source that states this.

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Very strange that he is nicknamed after the curse and not the refuah. – YDK May 22 '11 at 14:22
He canceled the curse, it's may be called type of refuah. – jutky May 22 '11 at 18:14
So it's a double play on words that the gezeirah of "Tam" was Tam? – YDK May 22 '11 at 20:50
It's not a play on words, you don't need the lat Tam. Just: "He canceled gzeira of Tam". – jutky May 23 '11 at 11:30
So, if he would have stopped the curse of pestilence they would call him Rabbeinu Dever?? – YDK May 23 '11 at 14:21

Ya'akov Avinu was known as an ish tam. Since they shared the first name Ya'akov (and possibly some personal character traits), one's appelation was applied to the other.

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Do you have a source for this? – Gershon Gold May 22 '11 at 3:38
The ריב"ש linked makes it clear that at least his use of "תם" was an allusion to Ya'akov Avinu, albeit a good 150 years after ר"ת lived. – WAF May 22 '11 at 3:43

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