In my parish, which is an older, inner city parish, the only "plaques" are on the stained glass windows. The majority of which read "In memory of...". In the vestibule of the church, there are plaques with 1' x 3" brass plates attached listing the items and the donors. The majority of these also read "In memory of...". The actual donors are not usually named.
Along this line, in the weekly bulletin, there will be mention of who donated flowers placed on the Tetrapod or surrounding the Feast Day icons. The majority read "Donated by...in thanksgiving to God on the occasion of their [wedding anniversary, birthday, namesday]" or "In memory of...".