There's a lot of opinion there. He is a normal Dad? He is not an English speaker? He is most likely a Portuguese speaker?
People did phone in to Crimewatch with names so he isn't necessarily Portuguese.
If the media got it right, one man was named twice, and one of those two calls came from Portugal.
That got me pondering who in Portugal could have come up with a suggested name.
The following is speculation, so bear in mind that my supporting 'evidence' is thin.
It was possible to view Crimewatch in Portugal. At least this matches up with a name coming from Portugal.
Since the programme was broadcast in English, it had to come from someone who was fluent or fairly capable in English. The normal language in Luz is English. The Dutch, Germans and English use, and local Portuguese folks use it.
However, local Portuguese people are geared up for Portuguese TV, not English TV.
So the person calling from Portugal is most likely to be an ex-pat, or someone working out here.
Then the person has to have an interest in the case. Most of the folks who were here at the time have an interest, even if opinion is strongly anti-McCann.
So, someone who is an English-speaker, gets English TV, has an interest in the case, and recognises the e-fit, without naming Gerry McCann.
The e-fit and the sole photo (AFAIK) of Tiago da Silva are attached. Tiago was one of the 11 witnesses interviewed in Dec 2013. He was a maintenance worker in the OC when Madeleine disappeared.
Tiago got touted in the press as having lost the entire set of keys to block 5 shortly before Madeleine disappeared. IMO, this is simply a fabrication.
The other potential reason for interviewing him was if he was named as a match to the e-fit. IF that was what happened, we need an English speaker, with access to English TV, in Portugal, interested in the Madeleine case, who knew Tiago.
The list of 11 witnesses contains at least two such people - John Hill and Donna Hill.
It gets a layer more complex, as we also need a person who was not in Portugal to come up with the same name.
Make up your own mind as to whether he is a Smithman e-fit candidate.