I'm getting in philosophy here, but really influence is a very broad term, and it can be both "positive" (Kotlin borrows something) and "negative" (Kotlin does something to avoid/rectify/solve/reverse some other language's problem). That's why I'm saying that a lot of stuff influenced Kotlin.
I have no doubt that designers of Kotlin have had at least some experience or knowledge of other languages, concepts and technologies, and all that gave them perspective, understanding and ideas about how to design Kotlin.
If by "influenced" OP means borrowing concepts, then I'd say Kotlin wasn't "influenced" by Swift, at the point where information about Swift was published, core Kotlin concepts were already formulated. A lot of other stuff did "influence" Kotlin though, one of the major contributors in this regard is probably C# as was mentioned on numerous occasions by Kotlin developers.