Here's what my son said:
As for your friends bike...it doesnt really have any "meaning" at all. It is called an "ATAJI", which is when they take the characters and arrange them by their pronunciation to make a new word that doesn't really exist.
From what I can tell you would pronounce the word ADORUFU, is that close to your friend's name? Anyways, to break it down into the different meanings I will give you a few examples of words that use these characters.
1) "A" - Akogi / ruthlessness, harshness, greed, meanness, ruthless, harsh, greedy, mean, hardhearted
motonomokuAmi / to lose all that one has gained, to go back to one's start
Aho / foolish, silly, stupid, a fool, an idiot, a blockhead, a stupid, an ass, a jerk, a moron
Asura / Asura is the guardian deity of the Buddhism which likes fights)
2) "DO" - DOryoku / effort, exertion, endeavor
3) "RU" - RUri / lapis lazuli, sky blue, azure
4) "FU" (also pronounced HO) - means "sail" like the sail on a sail boat.
Anyways, that's about as best I can do. Maybe send that off to your friend and see what they say. Maybe they should ask who told them about it what they had in mind when the chose the certain characters, or if they even knew the meaning at all. Most times people just check the sounds and randomly pick characters they think look cool.
Cliff.