Elva 1

Elva means 'eleven' in Swedish.

My grandma told me this name has an English origin "Elfin"--elf's friend.

It really is impossible to combine El- and -va and make a name that means "God + go". El is no more Latin than Coca-Cola, and va in Latin would have been ve-, as in venire. In modern languages derived from Latin, the va- form exists but that doesn't mean that sticking it on to a Hebrew syllable and calling the whole bundle Latin makes any kind of sense.

Also another version of it in Latin is "el"- meaning god or god's likeness, and "va" meaning goes or going. The meaning of that will be "God's likes goes." or "does God's likeness go?", or "where's God's likeness going?"