The standard Polish form of this name is Gabriela, which is currently very popular (\#23), but Gabriella has also been in use. Last year (2019), 21 baby girls were given the name Gabriella as a first name. 5 got it as a middle. In January 2020, 880 women in the whole Polish population had this first name, and 162 women had it as a middle name. Gabriellas could celebrate their name day with Gabrielas (19th December) or Gabriels (27th February, 24th March). Nicknames could be the same as for Gabriela.
― Anonymous User 10/7/2020
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In 2018, 2 is the most common age for an American (U.S.) Gabriella who is registered female with the Social Security Administration. It is the 645th most common female first name for living U.S. citizens.
― Anonymous User 10/15/2018
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Also used in Greece, variant transcription of the name Gavriella (Γαβριελλα).
In Italy Gabriella was typical of the 1940s. It was the 3th most popular name in Rome in 1941 (behind Annamaria and Anna, with the double name Maria Gabriella 25th) and the 7th in 1946. Today it doesn't sound totally old, but it's not even popular. I guess most Italians could hardly believe it's being so fashionable in English-speaking countries!