Alastair is a ♂ boy name.
Alastair is an Anglizised form of the name Alasdair, a Scottish-Gaelic variant of the name Alexander, which is of Greek origin.
Alastair means “defending men”, “defender of men”, “defender of the people” or “protector of men” (from ancient Greek “aléxein/ἀλέξειν” = to defend/protect + “anēr/ἀνήρ” = man).
Based on the frequency of positive ratings, we can analyze how popular names are in different countries. The name Alastair is currently ranked #3897 on the name leaderboard.
Curious about more trends? Find out which names are most popular in the USA, Canada, Australia, and worldwide.

| 2025 | 2024 | 2023 | 2022 | 2021 | |
|---|---|---|---|---|---|
| 🇦🇺 Australia | ✓ | - | - | ✓ | - |
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