Looking into the meaning of the place name Port Omna (anglicised as Portumna) I can't find anything else than "landing place of the oak".

If this is correct, what does it mean exactly? If the oak is the tree (or a tree trunk) does it have to be afloat to find a 'landing place'? Or is just meant "the place where the oak tree rooted" (or something like that)?

Thanks in advance.

The word omna (in modern Irish, omhna) can refer to an oak tree-trunk or just any tree-trunk, as well as some other things, such as a ship's mast or even (according to FGB) a "doughty warrior". I looked up the etymology, and port is a loan word (fairly obvious, since it starts with a "p"), ultimately from the Latin portus, and in place names can refer to a port, a fort, a platform, or a [river] bank, depending on the context. In an unrelated homonym coming from the Latin porto ("carry"), the word can refer to a song, as in the Scottish Gaelic term a port-a-beul (the original idea, I guess, being that one can carry a tune).

Flanagan's "Place Names of Ireland" says that the name Portumna (Port Omna) in County Galway "could be construed as either 'Bank of the tree-trunk' or 'Port of the tree-trunk' ". Since Portumna is on the northern bank of the Shannon, my guess (and it's a total guess) is that it's named for some sort of river landing platform made out of a large tree-trunk which was once located there.

_________________
I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

Thank you very much. As a Dutchman (and consequently not a native speaker of the English language) I seem to have misunderstood the meaning of 'landing place'. Your reaction has clarified a lot.