The origin of the word “blood”

The word “blood” comes from Old English “blod” which comes from Proto Germanic *blodam and both of those mean “blood”. However, *blodam is descended from Proto Indo European *bhlo-to- which means “to swell, gush, spurt”. The word “blood” is descended from a completely different word that other Indo European languages.

“blood” in Latin is “sanguis” which gave us French “sang” and Italian “sangue”. This word comes from Proto Indo European *h₁sh₂-én- (by the way, h₁ and h₂ represent two consonant produced in the general area of the larynx but linguists are not certain where exactly, so they are simply written as h₁ and h₂). It is cognate with Sanskrit “असृज् “‎ (asrj) and Ancient Greek “ἔαρ” ‎(éar).

In very common words such as numbers, there is a huge amount of similarity
Note: t and d are pronounced in the same place in the mouth, only voicing is different. Sometimes only voicing changes between two different stages of a languages evolution

English – two
Afrikaans – twee
Swedish – två
German – zwei

Portuguese – dois
Spanish – dos
Catalan – dos
French – deux

Breton – daou
Irish Gaelic – dó
Scottish Gaelic – dà

Russian – dva
Polish – dwa
Bulgarian – dva