I would never form the Union with Spain and "sacrifice" my contry name....
It's like England conquering France and the union would be call France....
Not really, no. This is not Portugal conquering the peninsula and naming themselves Castile. Spain is a new name, a new country, and only in OUR historical and nationalist perception looking back is spain everything-but-Portugal in that area. Spain conceptually applied to the whole region and included Portugal. Historically, Spain came to apply to everything else except for Portugal, but that was our history. Objections to the name Spain or any variation of it are 100% tied to a modern and possibly nationalist view that has no basis whatsoever in the context of what Spain meant before Isabella. Spain, in 1444, did not mean what it means today, and refusing to form Spain as a country dominated by Portugal instead of Castile is just being petty.
Sorry if that comes across as mean, but the attitude that I see here strikes me as racially charged and void of any historically legitimate complaint. Also, having Spanish friends doesn't mean you can't be racist against Spanish; saying "I'm not racist I have many black friends" is basically THE joke for identifying a racist person here in the USA.