If you are trying to recreate an accented name that already appears elsewhere (outside a code-edit-region) in your Worksheet/Document then lprint it as Robert suggests.
If you want it to appear as the typeset accented name inside the code-edit-region then you are out of luck.
If you are trying to construct an accented name as non-typeset, plaintext Maple Notation code, then you can either do a Robert suggests (create it in a 2D Math input elsewhere, and lprint that) or you can experiment with constructing it with code. For example,
Note that the above code is 1D Maple Notation plaintext code. You can paste it into a code-edit-region or an execution group as 1D code and it should work. If you mistakenly paste it into a paragraph or execution group in 2D Input mode then it won't properly show you the `ˆ` thing.
On my Linux it seems to me that the `∧` and `ˆ` and `&Hat'` identifiers all render the same. You could try each.
Using the `placehat` procedure above you can see the difference between mi and mn, in typesetting. The mn renders like the upright text that appears in the typeset rendering of a string.
I am not satisfied with how these accents get centered according to the bottom of an italic rendered name, rather than the top. To me the accent appears a little too far left, when over an italic symbol.