The best replacement for undefined is null.

The best alternatives to undefined are rated as following:
★★★★★  null
★★★★★  zero
★★★★  zero slope
★★★  indeterminate
★★★  no solution
★★★  0
★★  infinity
★★  null javascript
★★  does not exist
★★  no slope
★★  0 slope
★  typeof
★  unspecified
★  not defined
★  undefined
★  void 0
★  undeclared

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No companions for undefined have been suggested so far.
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Google Trends

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undefined
null
zero