Easy to spell, high value name with excellent connotations ("supreme" as an adjective means "very great or the greatest").
The name "supremer" has eight letters and three syllables. Leading companies using three syllable names include Mastercard, Nescafé and Sainsbury's.
This domain was first registered in March 2012. Older domains have an advantage when ranking in search engines.
Supremer.com is a dot com domain. Dot com domains are the most desirable top-level-domain in the world, used by famous websites like twitter.com. When most people think of a website, they think of a dot com.