Does the name of sitemap index file matter?

I am going to be submitting a new sitemap index file to yandex, yahoo, bing, ask and google. Due to technical issues I can't call the index sitemap.xml Does it matter at all to engines if its called something like sitemap2.xml or sitemapindex.xml?

the sitemap index will contain links to a few large xml.gz files that contain the actual site urls.

Thanks

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