How will one called on the day of Qiyamah?

Q: When we ask ulama the following question: "How will be called on the day of Qiyamah?" In the reply, there may be any of three answers:

  1. By mother's name [as mostly people say].
  2. By father's name except Hadhrat 'Isa (alaihis salaam). [I read it in Ahsanul Fataawa vol. 9 Pg.29]
  3. Some people will be called by their mothers' name and some will be called by fathers' name. [An Alim told me it is written in the footnotes of Abu Dawood 320]

​Please tell me the most correct opinion on this subject matter.

I'tikaaf in Musjidun Nabawi (Sallallahu Alayhi Wasallam)

Q: My question is regarding this year ramadaan. I intend on spending the sunnah ithikaaf in musjid un nabawi (17th-27th July - According to the saudi calendar). I would like to know if my ithikaaf would be valid if I leave on the eve of eid from Madinah and arrive in South Africa on the 28th, just to find that South Africa would be fasting on the 28th and celebrating eid on the 29th.What should I do in this regard? From calculations, its seems that the above scenario is most likely to occur?