Good evening, Elle!
Yes, ceilidhs have dances and are lively occasions.
I have not heard ceilidh as a girl's name?
Though "Eilidh" is.
Everything is in Gaelic on BBC Alba, even the football commentaries!
So they all have sub-titles.
It has long been the custom here to sing when first footing as your contribution to the fun.
Those who refused were looked down upon.
Now, the choice of song can be difficult, so I would choose one that I would be confident of not forgetting the words!
If asked I'd probably sing "The Holy Ground", which is a song about fishermen heading out to sea.
The Holy Ground is a district in Cobh, County Cork.