#多 is listed under the radical of #ゆうべ（夕/evening）. With 2 夕 put together, 多 means something that continues unlimitedly from this evening to the next evening.
Meaning: many, much
多分（タブン）: probably, likely
多分（タブン）（の/に）: much, a large quantity
多様（タヨウ）（な）: various, diverse
過多（カタ）: an excess, a surplus
雑多（ザッタ）（な）: sundry, miscellaneous
繁多（ハンタ）（な）: complicated, difficult
多い is an いadjective but as I wrote on Monday, it is not used in front of a noun in order to say “a large number/amount of xxx”.
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