> With extra sauce of numerous mergers and rebrandings

That's actually a good hypothesis that hasn't been examined before, I believe.

TBF, it's been called Tieto-something for thirty years or so. The most recent merger is visible as a suffix until the next one. Except if there isn't one for a while, then they revert to just Tieto after a few years.

Source: Worked at "TT Tietotehdas" (organic part of the name, not a suffix, AIUI) in 1996 and have had to do with it every now and then after that.

On the “suffix” side there was EDB -> rebranded EDB -> EDBErgoGroup -> Evry in several years. Also changed hands following a loss of major customer in 2015 before being merged with Tieto

Sure, but I wasn't thinking about this particular case but more generally. We have all sorts of results already on M&As from which to draw.