Across the world, Улдис (Uldis 
, Улдис 
, Uldys 
) is quite a rare masculine first name. The first name Улдис is characteristic of Northern Europe, particularly Latvia, where it is quite a common boy's name, Lithuania, where it is a rare masculine name, and Ireland. Not in comparison with a country's population, it is commonest in Latvia, the United States, and Russia. Much less frequently, Улдис is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Uldis | Latvia, United Kingdom, Sweden, United States, Germany |
| Улдис | Ukraine, Russia, Kazakhstan |
| Uldys | United States, Venezuela |
| клаусс, улдис мартиньш Latvian politician and economist (1929-2012), LV (b. 1929) |
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| крастс, улдис Livonian writer and journalist, LV (b. 1943) |
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| осис, улдис Latvian politician and economist, LV (b. 1948) |
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| офкантс, улдис LV (b. 1941) |
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| ансонс, улдис LV (b. 1959) |
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| саулите, улдис Latvian rugby union player, LV (b. 1980) |
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