Greetings.
Please, continue to enter names into FamilySearch. Do not give up because of questions about source material.
I myself enter a lot of names without an official source. Sometimes I upload a page from Communion book or birth/marriage/death to show the info I have found.
I try to be accurate with places of birth/marriage/death; for example:
"Sandbacka, Påras, Kronoby, Vasa, Finland"
"Whilobacka, Öfverpurmo, Pedersöre, Vasa, Finland"
I do not use farm names (places) as a surname. There are exceptions. Some uses multiple farm names as surnames, thus creating a traveling history. Example: Johan Andersson Vilobacka, H