Can I rearrange the given names of authors in Pubmed for importing to EndNote?
Just import the reference as Pubmed outputs it and then change the output style within Endnote to match your preferred format. If it's a standard format for a well known journal, you should be able to directly select that output style, otherwise, you can make a custom format using the formatting code for the style you want. There are several online guides out there that give details how to do that.  Examples:

http://libguides.usd.edu/content.php?pid=63203&amp;sid=755800

https://www.youtube.com/watch?v=lbq-naXl8r4  (see ~8mins in)