Lars Jonsson Ek was a former soldier (in Sweden called husar)and as such a man it was very common that youtook another surename. Only so they could be separeted from another Lars Jonsson. This is of course not 100% right in your case, but it was very common in those days. They normally used a name from their background or from where they came (from Eker village). I have a soldier from my ancestors who came from a place Långanäs, he could himself Magnusson Långnäs.

Olof Ek died 29th of April 1867.

Now I hope I am writing to the right person and you can recognise the info.
Please let me know if there is something else you will have about this family or somebody else and I will try to search for you.