Easy to spell, high value name with excellent connotations ("supreme" as an adjective means "very great or the greatest").
The name "supremer" has eight characters and three syllables. Established brands using three syllable names include Mastercard, Sainsbury's and Vodafone.
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 sought after domain extension in the world, used by famous websites like twitter.com. Once you own a dot-com, it will be much easier to rank for your own name in Google.