Default transliteration · Mary
玛丽 is not a name a native would pick
玛 is one of the most reliable foreign-name markers in the whole character set. If your name starts there, a native already knows what pipeline produced it.
玛丽
Two syllables, no surname, 玛 as the Mary/Maria hook. Hymnals, English tests, and well-meaning teachers converge on the same spelling. That convergence is the fingerprint.
玛丽亚
Three-character all-transcription. It looks like a caption under a Renaissance painting. Chinese personal names in ordinary life do not run to three foreign syllables with no 姓.
丽 is not a free pass
丽 appears in real given names. As the tail of 玛丽 it is not doing native work — it is finishing the sound of Mary. Pretty-girl suffixes (娜, 莉, 丽) on an otherwise thin name are a Fix; 玛丽 is already a Kill.