ive got a couple of domains with numbers for letters in them eg www.g4mbling.com
people say they arent worth anything but i like them, prob worth nothing undeveloped but if you develop and kinda take the piss outta the fact that its a number in your domain name then people will remember it, once you get traffic then its valuable
Umbro is a brand, your name mix letters with a number but the "0" is near the keyboard's "o", perhaps you got some direct typos, 268 googles, only 5 characters, dot com,... so my final pro-apprasail is...