Can "SketchUP" designs or models be imported in Autodesk Maya?

Yes you can import it and edit it as you want.

No you must first convert into fbx then import to maya 

You can import skp files to maya using plugins like, 1. Simlab 3D plugins 2. FBX plugin. Using Sketchup Pro, you can export it to Autodesk FBX which you can import to Maya and 3D Max.

ofcouse it could be obj export file

yeah, thanks for the share.

Yes you can import files using special plugins

yes you can if you convert to fxb file then import to maya