Good WikiTree protocol for this situation is to create Unmerged Matches between the three profiles, while initiating discussion on the best choice for LNAB. Also, it's a good idea to add the variant spelliings in the Other Last Names fields of these profiles -- to help future visitors to WikiTree recognize that the person they are looking for is already here.
Please do not choose LNAB based on the ages of the profiles, the number of family members connected to the profiles, the lengths of the biographies, the number of sources cited, or the number of images included. The LNAB should be the contributors' best estimate of the surname that the person had at time of birth, based on birth/baptism records (if such exist) or other available information. (And sometimes the best LNAB will be one that's not currently displayed on any of the profiles. If that happens, the LNAB on one profile should be changed to become that preferred LNAB, and the other profiles should be merged into that profile.)
When the profiles are merged, all of the information from the text sections of the different profiles will be included in the merged profile, and the person who completes the merge will needs to edit the text section of the merged profile to combine the biographical information and sources from individual profiles.