Names for our on-the-way triplets?

Hi!

So, my husband and I have four kids. The oldest is 15-year-old girl Jack, the next oldest is 11-year-old boy Sue, the next youngest is 8-year-old boy Sofi, and the youngest is 4-year-old girl Joe. We had decided to call it the quits, but then I found out I'm pregnant again. This time with triplets. We have no idea how that happened, there is almost no history of multiples in either of our families, I have twin cousins but that's it.

We want to continue our tradition of naming girls with 'traditional boy names' and boys with 'traditional girl names', but we're not completely sure of names. I know, some people are against naming girls 'boy names' and boys 'girl names', but we aren't much for traditions. The kids haven't been subject to any teasing, the only times we're asked about the names is why we decided to name our eldest Jack, because my husband's name is Jack, too.

I like two types of names: common names and then Victorian names, and we have decided to keep up the 'tradition' of three or four letter names. We would also like to go with Victorian now, because the others have relatively common ones =)

I'm only four months along, so we'll see how it progresses, but we want to be prepared as all the others were born premature, Jack three weeks before, Sue two weeks, Sofi other three weeks and then Joe only a week. So, there's really no pressure, but I am aware that multiples are typically premature, so it might be something like a month, though I hope not.

Here are a few ideas of mine:

Alva, Lila, Jane - for boys

Alan, Levi, Joel - for girls

Do you have any ideas?

Thanks in advance =)