A very important issue in research and merges of families is spelling.
We know for a fact that many names and surnames can and are spelled in different ways.
I'll give my surname as an example: Levy, a name that comes directly from the Bible, but it is spelled differently depending from which countries the ancestors came from, for example: Levi, Lowy, Lowi, Loewy, Loevi, and who knows how many other ways, while it is one of the shortest and simplest surnames.
As a tool, when I enter a name on the SEARCH NAME link on top right, it should give me all the possible variations of Levy, like it is done at the Yad Vashem site. This should be true also for first names.
Considering your specific example of Levi, it is worth noting that "plain" Soundex does NOT work very well for Slavic of Jewish names. Geni has stated they might add DM-Soundex at a later stage.
You would be suprised just how many Jews/Israelis are on Geni. We have four MOT in the Curator group of 24! I recently translated a Hebrew headstone for Noah Tutak, Geni's President.
Shmuel-Aharon Kam, a Levi