なあ

About

な (often elongated as なぁ or なー), is a casual sentence ender, mainly used by men. It is similar to ね, but sounds more straightforward, and is mainly used for emphatic purposes. ("hey" as opposed to "isn't it?").

The elongated なぁ is often used to emphasize one's wants and desires. This usage tends to be used more equally by men and women.

E.g. お金かねがほしいなぁ。"I want money."

Summary

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  な is a masculine, casual sentence ender that is similar to ね and depending on the context can sound either masculine or gender-neutral

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  な is mainly used for emphatic purposes

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  な can be elongated to なぁ or なー and is used to indicate one's wants and desires (this usage is more gender-neutral)