"Gaurika" does not have Omkaras name in it. It mainly has Gauris name ( Shrenu herself said that in the interview ) and not even Omkara ka "Kara" only ka. Gaurika will be Aanika and Gauris couple name. OmRi sounds just like OmRu there could be a confusion with both the couple names in future while typing so "Rikara" it is.
Rikara sounds also just like Ishqkara and has both there names equally. Also if u see the interview where Kunal was addressing Gaurika as there couple name he was actually addressing the fans to decide a good name. Will try & link u that interview if I find it. The voting poll was already done and "Rikara" won the poll. So let's not confuse further also in a few days SP will announce there couple name in the Show itself so lets wait for that. We should address them as Rikara so SP will automatically pick up the name the fans have chosen for sure.
If there is too much confusion then let's have a voting poll again.
Even on insta all are addressing them as Rikara.