You Do Need power plug adapter while traveling from Aruba to Ireland (Eire).

Here is Why You Need An Adapter

The outlet and plug type used in Ireland (Eire) is G and in Aruba are A, B and F. This is how they look like.

Aruba

In Aruba, outlets of type A, B and F are in use.

Type A

Type B

Type F

Ireland (Eire)

In Ireland (Eire), outlets of type G are in use.

Type G