Youhei as a word could mean 'mercenary', but as a name it has many ways of writing and thus many meanings hidden in each, some of which are:
耀平 : the first kanji is used in verb "to shine" and second is common kanji for peace, it could convey a meaning of 'bright peace', 'brillian peace', 'shining with peace'.
要平 : is another sense of writing it, whose meaning estimated from its kanji could be 'the key to peace', 'essence of peace'.
"Youhei" is a mercenary soldier.
The word 打算的 (dasanteki) may be used to mean 'mercenary' in Japanese. 傭兵 (youhei) may also be used.
"Olga" is not a Japanese word or name, so it doesn't mean anything at all in Japanese. Did you mean, "What is the name "Olga" translated to in Japanese?"
The name Michelle does not mean anything in Japanese, but can be written: ミシェル
The name 'Collin' does not mean anything in Japanese, but it can be written in Japanese as: コリン
what does the Japanese name utagawa mean
It does not mean anything in Japanese, but it can be written: ビンセント
It does not mean anything in Japanese, but can be written: マーラナ
Tucker is an English name and will have no meaning in Japanese.
The name Tony does not mean anything in Japanese, but can be written: トニー
The name Sandy does not mean anything in Japanese, but can be written: サンディー
The name Savannah does not mean anything in Japanese, but it can be written as: サバナ