As you are discovering you can't put a delimited list inside a variable and use IN to find all the values. You have a couple of choices here.
1) You could create a user defined table type and pass that. This is probably overkill for what you are doing here though.
2) You could use a string splitter. I recommend the one you would find by following the link in my signature about splitting strings.
Your final query would end up something like this.
SELECT *
FROM TEMPTABLE tt
CROSS APPLY dbo.DelimitedSplit8K(@Name, ',')
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Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.
Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.
Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/