[robin_reala]

Technically you can have multiple first-commits in a Git repository. For example, Linux had 4 initial commits in 2017: https://www.destroyallsoftware.com/blog/2017/the-biggest-and...

[arghwhat]

Indeed, through commits with multiple parents (merges), you can end up having multiple orphan commits (initial commits).

Multiple initial commits are a bit rarer, usually stemming from merging in entirely different git repos with their own separate history as part of consolidation.