This invented and professional name would be well suited to a photography, art or business brand.
J3e has only three letters and only one syllable. Single-syllable names are exceptionally rare and extremely desirable. Successful brands using one syllable names include Shell, Square and Path.
J3e.com is a dot com domain. Dot com domains are the most desirable top-level-domain in the world, famously used by websites like google.com. Owning a dot com says that you own the word "J3e" online.